Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China;
Department of Obstetrics and Gynecology, General Hospital of Beijing Military Region, Beijing 100700, China;
Department of Obstetrics and Gynecology, Navy General Hospital, Beijing 100000, China;
Department of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China;
Department of Pharmaceutical Outcomes and Policy, College of Pharmacy, University of Florida, Gainesville, FL 32611, USA;
Hallmark Health System, Medford, MA 02155, USA;
Department of Obstetrics and Gynecology, West China Second University Hospital, Chengdu, Sichuan 610041, China;
Department of Obstetrics and Gynecology, Tongzhou Maternal and Child Health Hospital of Beijing, Beijing 101101, China;
Department of Obstetrics and Gynecology, First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, Guangdong 510080, China;
Department of Obstetrics and Gynecology, Beijing Miyun Hospital, Beijing 101500, China;
Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing 100191, China;
Department of Obstetrics and Gynecology, Center Hospital of Aviation Industry, Beijing 100012, China;