1. Department of Obstetrics and Gynaecology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
2. Women Health Centre, Chulabhorn Hospital, HRH Princess Chulabhorn College of Medical Science, Chulabhon Royal Academy, Bangkok, Thailand.
3. Division of Obstetrics and Gynecology, Bangkok Hospital Udonthani, Udonthani, Thailand.