1. Women's Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, Jiangsu, People’s Republic of China
2. Department of Obstetrics and Gynecology, Jiangsu Taizhou People's Hospital, Taizhou, Jiangsu, People’s Republic of China
3. Department of Clinical Laboratory, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, Jiangsu, People’s Republic of China
4. Department of Obstetrics and Gynecology, The Second Affiliated Hospital of Medical University Of Anhui, Hefei, People’s Republic of China