- Correspondence to Professor Dingyun You, School of Public Health, Kunming Medical University, NHC Key Laboratory of Periconception Health Birth in Western China, Kunming 650500, China; ; Professor Yan Zhuang, School of Public Health, Department of Biostatistics, Southern Medical University, Guangzhou 510515, China;
- Received July 28, 2021
- Accepted November 27, 2021
- First published January 7, 2022.
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