1. Diabetes and Endocrinology Unit, Department of Medicine, Rajavithi Hospital, College of Medicine, Rangsit University, Krung Thep Maha Nakhon, Thailand
2. Division of Endocrinology and Metabolism, Department of Medicine, Faculty of Medicine, Prince of Songkla University Hospital, Hat Yai, Thailand
3. Division of Endocrinology, Department of Medicine, Maharaj Nakorn Chiang Mai Hospital, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
4. Department of Medicine, Maharat Nakhon Ratchasima Hospital, Nakhon Ratchasima, Thailand