1. Department of Obstetrics and Gynecology Affiliated Yantai Yuhuangding Hospital of Qingdao University Yantai Shandong Province China
2. Department of Obstetrics and Gynecology First Affiliated Hospital of Nanjing Medical University Nanjing Jiangsu Province China
3. Department of Obstetrics, Gynecology & Reproductive Sciences Yale Stem Cell Center, Yale University School of Medicine New Haven Connecticut
4. Department of Obstetrics, Women’s Hospital Zhejiang University School of Medicine Hangzhou Zhejiang P.R. China
5. Department of Cardiology, Beijing Anzhen Hospital Capital Medical University Beijing China
6. Department of General Surgery Affiliated Yantai Yuhuangding Hospital of Qingdao University Yantai Shandong Province China