1. Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
2. Diabetes and Thyroid Center, Theptarin Hospital, Bangkok, Thailand
3. Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
4. Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand