1. Department of Obstetrics and Gynaecology, Faculty of Medicine; Khon Kaen University; Khon Kaen Thailand
2. Department of Epidemiology and Biostatistics, Faculty of Public Health; Khon Kaen University; Khon Kaen Thailand
3. Gynaecological Oncology; Princess Alexandra Wing, Royal Cornwall Hospital; Truro UK
4. Department of Obstetrics and Gynaecology; Faculty of Medicine, Khon Kaen University; Khon Kaen Thailand