참고문헌
- American Academy of Pediatrics (2005). Breastfeeding and the use of human milk. Pediatrics 115:496-506 https://doi.org/10.1542/peds.2004-2491
- Badovinac RL, Werler MM, Williams PL, Kelsey KT & Hayes C (2007). Folic acid-containing supplement consumption during pregnancy and risk for oral clefts: a meta-analysis. Birth Defects Res A Clin Mol Teratol 79:8-15 https://doi.org/10.1002/bdra.20315
-
Bailey LB (2003). Folate, methyl-related nutrients, alcohol, and the MTHFR
$677C{\rightarrow}T$ polymorphism affect cancer risk: intake recommendations. J Nutr 133:3748S-3753S https://doi.org/10.1093/jn/133.11.3748S - Bailey LB, Rampersaud GC & Kauwell GP (2003). Folic acid supplements and fortification affect the risk for neural tube defects, vascular disease and cancer; evolving science. J Nutr 133:1961-1968S https://doi.org/10.1093/jn/133.6.1961S
- Baumslag N, Edelstein T & Metz J (1970). Reduction of incidence of prematurity by folic acid supplementation in pregnancy. Br Med J 1:16-17 https://doi.org/10.1136/bmj.1.5687.16
- Blackburn S & Loper DL (1992). The hematologic and hemostatic systems. In Blackburn S (ed), Maternal, fetal, and neonatal physiology: a clinical perspective, p.159-200. Saunders Company, Philadelphia. USA
- Blom HJ (1998). Mutated 5,10-methylenetetrahydrofolate reductase and moderate hyperhomocysteinaemia. Eur J Pediatr 157:S131-S134 https://doi.org/10.1007/PL00014297
- Blom HJ, Shaw GM, den Heijer M & Finnell RH (2006). Neural tube defects and folate: case far from closed. Nat Rev Neurosci 7:724-731 https://doi.org/10.1038/nrn1986
- Botto LD, Khoury MJ, Mulinare J & Erickson JD (1996). Periconceptional multivitamin use and the occurrence of conotruncal heart defects: results from a population-based, case-control study. Pediatrics 98:911-917
- Chanarin I (1969). The megaloblastic anaemias. Blackwell, London. UK
- Chang NS, Kang MH, Paik HY, Kim IH, Cho YW, Park SC & Shin YW (1993). Serum folate and iron levels of pregnant, lactating adn non-pregnant, non-lactating women. The Korean Journal of Nutrition 26:67-75
- Chen LT & Rivera MA (2004). The Costa Rican experience: reduction of neural tube defects following food fortification programs. Nutr Rev 62:S40-S43 https://doi.org/10.1301/nr.2004.jun.S40-S43
- Choi JH, Kim HA & Lim HS (2006). MTHFR polymorphism and folate status of Korean women of childbearing age. Nutritional Sciences 9:35-41
- Choumenkovitch SF, Jacques PF, Nadeau MR, WIlson PW, Rosenberg IH & Selhub J (2001). Folic acid fortification increases red blood cell foalte concentrations in the Framingham study. J Nutr 131:3277-3280
- Choumenkovitch SF, Selhub J, WIlson PW, Rader JI, Rosenberg IH & Jacques PF (2002). Folic acid intake from fortification in United States exceeds predictions. J Nutr 132:2792-2798
- Czeizel AE (1993). Prevention of congenital abnormalities by periconceptional multivitamin supplementation. BMJ 306:1645-1648 https://doi.org/10.1136/bmj.306.6893.1645
- Czeizel AE (1996). Reduction of urinary tract and cardiovascular defects by periconceptional multivitamin supplementation. Am J Med Genet 62:179-183 https://doi.org/10.1002/(SICI)1096-8628(19960315)62:2<179::AID-AJMG12>3.0.CO;2-L
- Czeizel AE, Timar L & Sarkozi A (1999). Dose-dependent effect of folic acid on the prevention of orofacial clefts. Pediatrics 104:e66 https://doi.org/10.1542/peds.104.6.e66
- Daly LE, Kirke PN, Molloy A, Weir DG & Scott JM (1995). Folate levels and neural tube defects. Implications for prevention. JAMA 274:1698-702 https://doi.org/10.1001/jama.274.21.1698
-
Davis SR, Quinlivan EP, Shelnutt KP, Maneval DR, Ghandour H, Capdevila A, Coats BS, Wagner C, Selhub J, Bailey LB, Shuster JJ, Stacpoole PW & Gregory JF 3rd (2005). The methylenetetrahydrofolate reductase
$677C{\rightarrow}T$ polymorphism and dietary folate restriction affect plasma one-carbon metabolites and red blood cell folate concentrations and distribution in women. J Nutr 135:1040-1044 https://doi.org/10.1093/jn/135.5.1040 - De Wals P, Rusen ID, Lee NS, Morin P & Niyonsenga T (2003). Trend in prevalence of neural tube defects in Quebec. Birth Defects Res A Clin Mol Teratol 67:919-923 https://doi.org/10.1002/bdra.10124
- Dietrich M, Brown CJ & Block G (2005). The effect of folate fortification of cereal-grain products on blood folate status, dietary folate intake, and dietary folate sources among adult nonsupplement users in the United States. J Am Coll Nutr 24:266-274 https://doi.org/10.1080/07315724.2005.10719474
- Eichholzer M, Tonz O & Zimmermann R (2006). Folic acid: a public-health challenge. Lancet 367:1352-1361 https://doi.org/10.1016/S0140-6736(06)68582-6
- Eskes TK (2006). Abnormal folate metabolism in mothers with Down syndrome offspring: review of the literature. Eur J Obstet Gynecol Reprod Biol 124:130-133 https://doi.org/10.1016/j.ejogrb.2005.07.028
- French AE, Grant R, Weitzman S, Ray JG, Vermeulen MJ, Sung L, Greenberg M & Koren G (2003). Folic acid food fortification is associated with a decline in neuroblatoma. Clin Pharmacol Ther 74:288-294 https://doi.org/10.1016/S0009-9236(03)00200-5
- Friso S, Choi SW, Girelli D, Mason JB, Dolnikowski GG, Bagley PJ, Olivieri O, Jacques PF, Rosenberg IH, Corrocher R & Selhub J (2002). A common mutation in the 5,10-methylenetetrahydrofolate reductase gene affects genomic DNA methylation through an interaction with folate status. Proc Natl Acad Sci USA 99: 5606-5611
- Frosst P, Blom HJ, Milos R, Goyette P, Sheppard CA, Matthews RG, Boers GJ, den Heijer M, Kluijtmans LA & van den Heuvel LP et al. (1995). A candidate genetic risk factor for vascular disease: a common mutation in methylenetetrahydrofolate reductase. Nat Genet 10:111-113 https://doi.org/10.1038/ng0595-111
- Goyette P, Sumner JS, Milos R, Duncan AM, Rosenblatt DS, Matthews RG & Rozen R (1994). Human methylenetetrahydrofolate reductase: isolation of cDNA, mapping and mutation identification. Nat Genet 7:195-200 https://doi.org/10.1038/ng0694-195
- Green TJ, Allen OB & O'Connor DL (1998a). A three-day weighed food record and a semiquantitative food-frequency questionnaire are valid measures for assessing the folate and vitamin B-12 intakes of women aged 16 to 19 years. J Nutr 128:1665-1671
- Green TJ, Houghton LA, Donovan U, Gibson RS & O'Connor DL (1998b). Oral contraceptives did not affect biochemical folate indexes and homocysteine concentrations in adolescent females. J Am Diet Assoc 98:49-55 https://doi.org/10.1016/S0002-8223(98)00014-5
- Gucciardi E, Pietrusiak MA, Reynolds DL & Rouleau J (2002). Incidence of neural tube defects in Ontario, 1986-1999. CMAJ 167:237-240
- Han YH, Yon M & Hyun TH (2005). Folate intake estimated with an updated database and its association to blood folate and homocysteine in Korean college students. Eur J Clin Nutr 59: 246-254 https://doi.org/10.1038/sj.ejcn.1602065
- Health Canada (2004). Exclusive breastfeeding duration. http://www.hc-sc.gc.ca/fn-an/nutrition/child-enfant/infant-nourisson/excl_bf_dur-dur_am_excl_e.html. Accessed on 2004
- Health Canada (2007). Eating Well with Canada's Food Guide: A Resource for Educators and Communicators. http:// www.healthcanada.gc.ca/foodguide. Accessed on 2007
- Hertrampf E & Cortes F (2004). Folic acid fortification of wheat flour: Chile. Nutr Rev 62:S44-8; discussion S49 https://doi.org/10.1301/nr.2004.jun.S44-S48
- Hirsch S, de la Maza P, Barrera G, Gattas V, Petermann M & Bunout D (2002). The Chilean flour folic acid fortification program reduces serum homocysteine levels and masks vitamin B-12 deficiency in elderly people. J Nutr 132:289-291
- Honein MA, Paulozzi LJ, Mathews TJ, Erickson JD & Wong LY (2001). Impact of folic acid fortification of the US food supply on the occurrence of neural tube defects. JAMA 285:2981-2986 https://doi.org/10.1001/jama.285.23.2981
- Houghton LA, Sherwood KL, Pawlosky R, Ito S & O'Connor DL (2006). [6S]-5-Methyltetrahydrofolate is at least as effective as folic acid in preventing a decline in blood folate concentrations during lactation. Am J Clin Nutr 83:842-850 https://doi.org/10.1093/ajcn/83.4.842
- House JD, March SB, Ratnam MS, Crowley M & Friel JK (2006). Improvements in the status of folate and cobalamin in pregnant Newfoundland women are consistent with observed reductions in the incidence of neural tube defects. Can J Public Health 97:132-135
-
Institute of Medicine (1998). Food and Nutrition Board. Dietary reference intakes for thiamin, riboflavin, niacin, vitamin
$B_6$ , folate, vitamin$B_{12}$ , pantothenic acid, biotin, and choline. National Academy Press, Washington, DC. USA - Iyengar L & Rajalakshmi K (1975). Effect of folic acid supplement on birth weights of infants. Am J Obstet Gynecol 122:332-336 https://doi.org/10.1016/0002-9378(75)90179-9
- Jacques PF, Bostom AG, Williams RR, Ellison RC, Eckfeldt JH, Rosenberg IH, Selhub J & Rozen R (1996). Relation between folate status, a common mutation in methylenetetrahydrofolate reductase, and plasma homocysteine concentrations. Circulation 93:7-9 https://doi.org/10.1161/01.CIR.93.1.7
- Jacques PF, Selhub J, Bostom AG, Wilson, PW & Rosenberg IH (1999). The effect of folic acid fortification on plasma folate and total homocysteine concentrations. New Engl J Med 340:1449-1454 https://doi.org/10.1056/NEJM199905133401901
- Jugessur A, Wilcox AJ, Lie RT, Murray JC, Taylor JA, Ulvik A, Drevon CA, Vindenes HA & Abyholm FE (2003). Exploring the effects of methylenetetrahydrofolate reductase gene variants C677T and A1298C on the risk of orofacial clefts in 261 Norwegian case-parent triads. Am J Epidemiol 157:1083-1091 https://doi.org/10.1093/aje/kwg097
- Jung SC, Kim SS, Yoon KS & Lee JS (1999). Prevalence of congenital malformations and genetic diseases in Korea. J Hum Genet 44:30-34 https://doi.org/10.1007/s100380050102
- Kim KN, Kim YJ & Chang N (2004). Effects of the interaction between the C677T 5,10-methylenetetrahydrofolate reductase polymorphism and serum B vitamins on homocysteine levels in pregnant women. Eur J Clin Nutr 58:10-16 https://doi.org/10.1038/sj.ejcn.1601729
- Kim YI (1999). Folate and carcinogenesis: evidence, mechanisms, and implications. J Nutr Biochem 10:66-88 https://doi.org/10.1016/S0955-2863(98)00074-6
- Kim YI (2000). Methylenetetrahydrofolate reductase polymorphisms, folate, and cancer risk: a paradigm of gene-nutrient interactions in carcinogenesis. Nutr Rev 95:205-209
- Kim YI (2003). Role of folate in colon cnacer development and progression. J Nutr 133:3731-3795
- Kim YI (2004a). Folate and DNA methylation: a mechanistic link between folate deficiency and colorectal cancer? Cancer Epidemiol Biomarkers Prev 13:511-519
- Kim YI (2004b). Will mandatory folic acid fortification prevent or promote cancer? Am J Clin Nutr 80:1123-1128 https://doi.org/10.1093/ajcn/80.5.1123
- Kleinman RE (2004). Pediatric Nutrition Handbook. Fifth Edition, Vol. 3, Breastfeeding, p.55-86. American Academy of Pediatrics. USA
- Lee JI, Lee JA & Lim HS (2005). Effect of time of initiation and dose of prenatal iron and folic acid supplementation on iron and folate nutriture of Korean women during pregnancy. Am J Clin Nutr 82:843-849 https://doi.org/10.1093/ajcn/82.4.843
- Li DK, Daling JR, Mueller BA, Hickok DE, Fantel AG & Weiss NS (1995). Periconceptional multivitamin use in relation to the risk of congenital urinary tract anomalies. Epidemiology 6:212-218 https://doi.org/10.1097/00001648-199505000-00004
- Lim HS, Jin HO & Lee JA (2000). Dietary intakes and status of folate in Korean women of child-bearing potential. The Korean Journal of Nutrition 33:296-303
- Lim HS, Lee JI &Lee JA (1999). Folate status of Korean pregnant women and their pregnancy outcomes - a cross-section study. The Korean Journal of Nutrition 32:592-597
- Lindsey LLM, Carter H, Pruc C & Mulinare J (2005). Use of dietary supplements containing folic acid among women of childbearing age-United States 2005. MMWR Weekly 54:955-958
- Liu S, West R, Randell E, Longerich L, O'Connor KS, Scott H, Crowley M, Lam A, Prabhakaran V & McCourt C (2004). A comprehensive evaluation of food fortification with folic acid for the primary prevention of neural tube defects. BMC Pregnancy Childbirth 4:20 https://doi.org/10.1186/1471-2393-4-20
- Lucock M (2000). Folic acid: nutritional biochemistry, molecular biology, and role in disease processes. Mol Genet Metab 71: 121-38 https://doi.org/10.1006/mgme.2000.3027
- Lumley J, Watson L, Watson M & Bower C (2001). Periconceptional supplementation with folate and/or multivitamins for preventing neural tube defects. Cochrane Database Syst Rev CD001056
- Ma J, Stampfer MJ, Giovannucci E, Artigas C, Hunter DJ, Fuchs C, Willett WC, Selhub J, Hennekens CH & Rozen R (1997). Methylenetetrahydrofolate reductase polymorphism, dietary interactions and risk of colorectal cancer. Cancer Res 57:1098-1102
- Mackey AD & Picciano MF (1999). Maternal folate status during extended lactation and the effect of supplemental folic acid. Am J Clin Nutr 69:285-292 https://doi.org/10.1093/ajcn/69.2.285
- Mathews F, Yudkin P & Neil A (1998). Folates in the periconceptional period: are women getting enough? Br J Obstet Gynaecol 105:954-959 https://doi.org/10.1111/j.1471-0528.1998.tb10257.x
- Mills JL, Kirke PN, Molloy AM, Burke H, Conley MR, Lee YJ, Mayne PD, Weir DG & Scott JM (1999). Methylenetetrahydrofolate reductase thermolabile variant and oral clefts. Am J Med Genet 86:71-74 https://doi.org/10.1002/(SICI)1096-8628(19990903)86:1<71::AID-AJMG14>3.0.CO;2-Y
- Morin P, De Wals P, Noiseux M, Niyonsenga T, St-Cyr-Tribble D & Tremblay C (2002). Pregnancy planning and folic acid supplement use: results from a survey in Quebec. Prev Med 35:143-149 https://doi.org/10.1006/pmed.2002.1041
- MRC Vitamin Study Research Group (1991). Prevention of neural tube defects: results of the Medical Research Council Vitamin Study. Lancet 338:131-137 https://doi.org/10.1016/0140-6736(91)90133-A
- Nakazawa Y, Chiba K, Imatoh N, Kotorii T & Sakamoto T (1983). Ishizaki T: Serum folic acid levels and antipyrine clearance rates in smokers and non-smokers. Drug Alcohol Depend 11:201-207 https://doi.org/10.1016/0376-8716(83)90079-0
- O'Connor DL (1994). The folate status of Canadian women. In Koren G (ed), Folic acid for the prevention of neural tube defects. The Motherisk Program, Toronto. Canada
- O'Connor DL, Green T & Picciano MF (1997). Maternal folate status and lactation. J Mammary Gland Biol Neoplasia 2:279-289 https://doi.org/10.1023/A:1026388522182
- O'Connor DL, Tamura T & Picciano MF (1991). Pteroylpolyglutamates in human milk. Am J Clin Nutr 53:930-934 https://doi.org/10.1093/ajcn/53.4.930
- Oi S (2003). Current status of prenatal management of fetal spina bifida in the world: worldwide cooperative survey on the medicoethical issue. Childs Nerv Syst 19:596-599 https://doi.org/10.1007/s00381-003-0778-1
- Ortega RM, Lopez-Sobaler AM, Gonzalez-Gross MM, Redondo RM, Marzana I, Zamora MJ & Andres P (1994). Influence of smoking on folate intake and blood folate concentrations in a group of elderly Spanish men. J Am Coll Nutr 13:68-72 https://doi.org/10.1080/07315724.1994.10718374
- Parle-McDermott A, Mills JL, Molloy AM, Carroll N, Kirke PN, Cox C, Conley MR, Pangilinan FJ, Brody LC & Scott JM (2006). The MTHFR 1298CC and 677TT genotypes have opposite associations with red cell folate levels. Mol Genet Metab 88:290-294 https://doi.org/10.1016/j.ymgme.2006.02.011
- Persad VL, Van den Hof MC, Dube JM & Zimmer P (2002). Incidence of open neural tube defects in Nova Scotia after folic acid fortification. CMAJ 167:241-245
- Pfeiffer CM, Rogers LM, Bailey LB & Gregory JF 3rd (1997). Absorption of folate from fortified cereal-grain products and of supplemental folate consumed with or without food determined by using a dual-label stable-isotope protocol. Am J Clin Nutr 66:1388-1397 https://doi.org/10.1093/ajcn/66.6.1388
- Picciano M, Green T & O'Connor D (1994). The folate status of women and health. Nutr Today 29:20-29 https://doi.org/10.1097/00017285-199412000-00005
- Piyathilake CJ, Macaluso M, Hine RJ, Richards EW & Krumdieck CL (1994). Local and systemic effects of cigarette smoking on folate and vitamin B-12. Am J Clin Nutr 60:559-566 https://doi.org/10.1093/ajcn/60.4.559
- Quinlivan EP & Gregory JF 3rd (2003a). Effect of food fortification on folic acid intake in the United States. Am J Clin Nutr 77: 221-225 https://doi.org/10.1093/ajcn/77.1.221
- Quinlivan EP & Gregory JF 3rd (2003b). The impact of food fortification on folic acid intake in Canada. Can J Public Health 94:154
- Qvist I, Abdulla M, Jagerstad M & Svensson S (1986). Iron, zinc and folate status during pregnancy and two months after delivery. Acta Obstet Gynecol Scand 65:15-22
- Ray JG (1998). Meta-analysis of hyperhomocysteinemia as a risk factor for venous thromboembolic disease. Arch Intern Med 158:2101-2106 https://doi.org/10.1001/archinte.158.19.2101
- Ray JG (2004). Folic acid food fortification in Canada. Nutr Rev 62:S35-S39 https://doi.org/10.1301/nr.2004.jun.S35-S39
- Ray JG, Meier C, Vermeulen MJ, Boss S, Wyatt PR & Cole DE (2002a). Association of neural tube defects and folic acid food fortification in Canada. Lancet 360:2047-2048 https://doi.org/10.1016/S0140-6736(02)11994-5
- Ray JG, Meier C, Vermeulen MJ, Wyatt PR & Cole DE (2003). Association between folic acid food fortification and congenital orofacial clefts. J Pediatr 143:805-807 https://doi.org/10.1067/S0022-3476(03)00495-5
- Ray JG, Vermeulen MJ, Boss SC & Cole DE (2002b). Declining rate of folate insufficiency among adults following increased folic acid food fortification in Canada. Can J Public Health 93:249-253
- Ray JG, Vermeulen MJ, Boss SC & Cole DE (2002c). Increased red cell folate concentrations in women of reproductive age after Canadian folic acid food fortification. Epidemiology 13:238-240
- Regulatory impact analysis statement (1998). SOR/98-550, Canada Gazette Part II, 3029-3033
- Scholl TO, Hediger ML, Schall JI, Khoo CS & Fischer RL (1996). Dietary and serum folate: their influence on the outcome of pregnancy. Am J Clin Nutr 63:520-525 https://doi.org/10.1093/ajcn/63.4.520
- Seshadri S, Beiser A, Selhub J, Jacques PF, Rosenberg IH, D'Agostino RB, Wilson PW & Wolf PA (2002). Plasma homocysteine as a risk factor for dementia and Alzheimer's disease. N Engl J Med 346:476-483 https://doi.org/10.1056/NEJMoa011613
- Senti FR & Pilch SM (1985). Analysis of folate data from the second National Health and Nutrition Examination Survey (NHANES II). J Nutr 115:1398-1402 https://doi.org/10.1093/jn/115.11.1398
- Shaw GM, O'Malley CD, Wasserman CR, Tolarova MM & Lammer EJ (1995). Maternal periconceptional use of multivitamins and reduced risk for conotruncal heart defects and limb deficiencies among offspring. Am J Med Genet 59:536-545 https://doi.org/10.1002/ajmg.1320590428
- Shaw GM, Rozen R, Finnell RH, Todoroff K & Lammer EJ (1998). Infant C677T mutation in MTHFR, maternal periconceptional vitamin use, and cleft lip. Am J Med Genet 80:196-198 https://doi.org/10.1002/(SICI)1096-8628(19981116)80:3<196::AID-AJMG2>3.0.CO;2-V
- Sherwood KL, Houghton LA, Tarasuk V & O'Connor DL (2006). One-third of pregnant and lactating women may not be meeting their folate requirements from diet alone based on mandated levels of folic acid fortification. J Nutr 136:2820-2826
- Smith DE, Kok RM, Teerlink T, Jakobs C & Smulders YM (2006). Quantitative determination of erythrocyte folate vitamer distribution by liquid chromatography-tandem mass spectrometry. Clin Chem Lab Med 44:450-459 https://doi.org/10.1515/CCLM.2006.085
- Smithells RW, Sheppard S & Schorah CJ (1976). Vitamin deficiencies and neural tube defects. Arch Dis Child 51:944-950 https://doi.org/10.1136/adc.51.12.944
- Smulders YM, Smith DE, Kok RM, Teerlink T, Gellekink H, Vaes WH, Stehouwer CD & Jakobs C (2007). Red blood cell folate vitamer distribution in healthy subjects is determined by the methylenetetrahydrofolate reductase C677T polymorphism and by the total folate status. J Nutr Biochem Apr 4;[Epub ahead of print]
- Sohn KJ, Croxford R, Yates Z, Lucock M & Kim YI (2004). Effect of the methylenetetrahydrofolate reductase C677T polymorphism on chemosensitivity of colon and breast cancer cells to 5-fluorouracil and methotrexate. J Natl Cancer Inst 96:134-144 https://doi.org/10.1093/jnci/djh015
- Sutterlin MW, Bussen SS, Rieger L, Dietl J & Steck T (2003). Serum folate and Vitamin B12 levels in women using modern oral contraceptives (OC) containing 20 microg ethinyl estradiol. Eur J Obstet Gynecol Reprod Biol 107:57-61 https://doi.org/10.1016/S0301-2115(02)00371-8
- Tamura T & Picciano MF (2006). Folate and human reproduction. Am J Clin Nutr 83:993-1016 https://doi.org/10.1093/ajcn/83.5.993
- Tolarova M (1982). Periconceptional supplementation with vitamins and folic acid to prevent recurrence of cleft lip. Lancet 2:217
- Ueland PM, Hustad S, Schneede J, Refsum H & Vollset SE (2001). Biological and clinical implications of the MTHFR C677T polymorphism. Trends Pharmacol Sci 22:195-201 https://doi.org/10.1016/S0165-6147(00)01675-8
- van Rooij IA, Vermeij-Keers C, Kluijtmans LA, Ocke MC, Zielhuis GA, Goorhuis-Brouwer SM, van der Biezen JJ, Kuijpers-Jagtman AM & Steegers-Theunissen RP (2003). Does the interaction between maternal folate intake and the methylenetetrahydrofolate reductase polymorphisms affect the risk of cleft lip with or without cleft palate? Am J Epidemiol 157:583-591 https://doi.org/10.1093/aje/kwg005
- Vollset SE, Refsum H, Irgens LM, Emblem BM, Tverdal A, Gjessing HK, Monsen AL & Ueland PM (2000). Plasma total homocysteine, pregnancy complications, and adverse pregnancy outcomes: the Hordaland Homocysteine study. Am J Clin Nutr 71:962-968 https://doi.org/10.1093/ajcn/71.4.962
- Wilcox AJ (2001). On the importance-and the unimportance-of birthweight. Int J Epidemiol 30:1233-1241 https://doi.org/10.1093/ije/30.6.1233
- Wilcox AJ, Lie RT, Solvoll K, Taylor J, McConnaughey DR, Abyholm F, Vindenes H, Vollset SE & Drevon CA (2007). Folic acid supplements and risk of facial clefts: national population based case-control study. BMJ 334:464 https://doi.org/10.1136/bmj.39079.618287.0B
- Witter FR, Blake DA, Baumgardner R, Mellits ED & Niebyl JR (1982). Folate, carotene, and smoking. Am J Obstet Gynecol 144:857 https://doi.org/10.1016/0002-9378(82)90369-6
- World Health Organization (2001). Global Strategies for Infant and Young Child Feeding. Resolution Passes at: Fifty-fourth World Health Assembly; May 9. http//www.who.int/ child-adolescenthealth/NUTRITION/global_strategy.htm. Accessed on 2001
- Wouters MG, Boers GH, Blom HJ, Trijbels FJ, Thomas CM, Borm GF, Steegers-Theunissen RP & Eskes TK (1993). Hyperhomocysteinemia: a risk factor in women with unexplained recurrent early pregnancy loss. Fertil Steril 60:820-825 https://doi.org/10.1016/S0015-0282(16)56282-7
- Yon M & Hyun TH (2003). Folate content of foods commonly consumed in Korea measured after trienzyme extraction. Nutr Res 23:735-746