1. Department of Obstetrics and Gynaecology, National University Health System (NUHS), Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
2. Biostatistics Unit, National University Health System (NUHS), Yong Loo Lin School of Medicine, National University of Singapore, Singapore.
3. Department of Obstetrics and Gynaecology, Adam Malik Hospital, University of North Sumatera, Medan, Indonesia.
4. Department of Obstetrics & Gynaecology, Sanglah Denpasar Hospital, University of Udayana, Denpasar, Indonesia.
5. Department of Obstetrics & Gynaecology, Dr Mohammad Hoesin General Hospital, Uiiversity of Sriwijaya, Palembang, Indonesia.
6. Department of Obstetrics & Gynaecology, Division of Oncology, University of Indonesia, Jakarta, Indonesia.
7. Department of Obstetrics & Gynaecology, Dr Sardjito Hospital, University Gadja Mada, Yogyakarta, Indonesia.
8. Tu Du Hospital, Ho Chi Minh, Vietnam.