Acknowledgement
The authors thank Zebin Xiao, at University of Pennsylvania, Philadelphia, US, for manuscript editing. We are also grateful to Weiwei Zheng, at Environmental Health, School of Public Health, Fudan University, Shanghai, China, and Dajun Tian, at Epidemiology and Biostatistics, College for Public Health and Social Justice, Saint Louis University, Saint Louis, Missouri, USA, for their assistance in statistical analyses.
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