1. Department of Obstetrics and Gynecology, The Second Hospital of Nanjing, Nanjing University of Chinese Medicine, Nanjing, China
2. Department of Hepatology, The Fifth People’s Hospital of Wuxi, Wuxi, China
3. Department of Obstetrics and Gynecology, The Maternal and Child Health Hospital of Lianyungang, Lianyungang, China
4. Department of Obstetrics and Gynecology, The Maternal and Child Health Hospital of Huai’an, Huai’an, China
5. Department of Obstetrics and Gynecology, The Second Hospital of Nanjing, Medical School of Nanjing University, Nanjing, China