Acknowledgement
The authors would like to thank Prof. Hoang Lan Nguyen, Dr. Thanh Xuan Nguyen, Dr. The Thanh Nguyen, Dr. Quynh Anh Nguyen Dac, two hospital board of directors, doctors, nurses, volunteers and participants for their support and contributions to this study. The funder played no role in the study design, data collection and analysis, decision to publish, or manuscript preparation.
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