1. Gynecologic Oncology Division, Department of Obstetrics and Gynecology Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand
2. Gynecologic Oncology Division Department of Obstetrics and Gynecology Faculty of Medicine Chiang Mai University Chiang Mai Thailand
3. Clinical Epidemiology Clinic, Office for Research and Development, Faculty of Medicine Siriraj Hospital Mahidol University Bangkok Thailand