Affiliation

• ¹ From the Divisions of Information Management (J-BQ, e-mail: qinjiabi123@126.com) and Medical Genetics (HW), Hunan Provincial Maternal and Child Health Care Hospital, Changsha, China; the Department of Epidemiology and Health Statistics, School of Public Health, Central South University, Changsha, China (T-BY); and the Department of Epidemiology, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, China (F-RL).