Affiliation: | 1. Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China 2. Wuhan Centers for Disease Prevention and Control, Wuhan, 430015, China 3. Anyang Maternal and Child Health Care Hospital in Henan Province, Anyang, 455000, China 4. Yichang Maternal and Child Health Care Center in Hubei Province, Yichang, 443000, China
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