1. Department of Obstetrics and Gynaecology, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu 215006, P.R. China
2. Department of Medical Engineering, Suzhou Municipal Hospital, Suzhou, Jiangsu 215008, P.R. China
3. Department of Dermatology, Suzhou Municipal Hospital, Suzhou, Jiangsu 215008, P.R. China