Affiliation: | 1. Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand;2. The Health Intervention and Technology Assessment Program (HITAP), Department of Health, Ministry of Public Health, Nonthaburi, Thailand;3. Department of Statistics, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand;4. Special Medical Center, Srinagarind Hospital, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand |