1. Environmental-Occupational Health Sciences and Non Communicable Diseases Research Group, Research Institute for Health Sciences, Chiang Mai University, Chiang Mai, Thailand
2. Department of Community Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
3. Department of Surgery, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
4. Clinical Surgical Research Center, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand