1. Khon Kaen University; Department of Surgery, Faculty of Medicine; 123 Mitraparb Road Khon Kaen Khon Kaen Thailand 40002
2. Khon Kaen University; Department of Obstetrics and Gynaecology, Faculty of Medicine; 123 Mitraparb Road Amphur Muang Khon Kaen Thailand 40002
3. Faculty of Medicine, Khon Kean University; Cancer Unit, Srinagarind Hospital; Khon Kaen Thailand 40002
4. Khon Kaen University; Epidemiology and Biostatistics Department, Public Health Faculty; Mitraparp Road Mueng District Khon Kaen Khon Kaen Thailand 40002