1. Department of Surgery, Faculty of Medicine; Khon Kaen University; Khon Kaen Thailand
2. Department of Pathology, Faculty of Medicine; Khon Kaen University; Khon Kaen Thailand
3. Department of Community Medicine, Faculty of Medicine; Khon Kaen University; Khon Kaen Thailand
4. Cancer Unit, Srinagarind Hospital; Khon Kaen University; Khon Kaen Thailand