1. Department of Medicine, Chiang Mai University, Chiang Mai, Thailand, 50200
2. Department of Surgery, Chiang Mai University, Chiang Mai, Thailand, 50200
3. Department of Surgery, Chiang Mai University, Chiang Mai,Thailand, 50200
4. Pharmacoepidemiology and Statistics Research Center (PESRC), Chiang Mai University, Chiang Mai, Thailand, 50200
5. Department of Anesthesiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand, 50200