Division of Infectious Diseases Affiliated Nanshan Hospital of Guangdong Medical College Shenzhen 518052 China;
0.Division of Obstetrics & Gynecology Third Affiliated Hospital of Hebei Medical University Shijiazhuang Hebei 050051 China;
Antiviral Research Center School of Pharmaceutical Sciences Southern Medical University Guangzhou Guangdong 510515 China;
Viral Immunology Laboratory Lindsley F.Kimball Research Institute New York Blood Center New York NY 10065 USA;
Division of Obstetrics & Gynecology First Hospital of Beijing University Beijing 100034 China;
Department of Medical Statistics First Hospital of Beijing University Beijing 100034 China;
Division of Obstetrics & Gynecology Third Hospital of Beijing University Beijing 100083 China;
Division of Obstetrics & Gynecology First Affiliated Hospital of Jilin University Changchun Jilin 130021 China;
Division of Obstetrics & Gynecology First Affiliated Hospital of Zhengzhou University Zhengzhou Henan 450052 China;
Division of Obstetrics & Gynecology Affiliated Xijing Hospital of the Fourth Military Medical University Xi'an Shaanxi 710032 China;
Division of Obstetrics & Gynecology First Hospital of Nanjing Nanjing Jiangsu 210029 China;
Division of Obstetrics & Gynecology Second Affiliated Hospital of Hebei Medical University Shijiazhuang Hebei 050000 China;