Sci Bull (Beijing)
Institute of Reproductive and Child Health, National Health Commission Key Laboratory of Reproductive Health, Peking University Health Science Center, Beijing 100191, China; Office for National Maternal and Child Health Statistics of China, School of Public Health, Peking University Health Science Center, Beijing 100191, China; Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing 100191, China; Reproductive Health Research Center of Peking University Health Science Center, Beijing 100191, China. Electronic address:
Published: October 2018