1. The Department of Obstetrics and Gynaecology, The University of Auckland, Auckland, New Zealand
2. Department of Gynaecology, The Hospital of Obstetrics and Gynaecology, Fudan University, Shanghai, China
3. School of Medicine, The University of Manchester, Manchester, U.K.
4. Department of Gynaecology, The Affiliated Wuxi Maternity and Child Health Care Hospital of Nanjing Medical University, Wuxi, China