1. Division of Pediatric Endocrinology; Faculty of Medicine Siriraj Hospital; Department of Pediatrics; Mahidol University; Bangkok Thailand
2. Clinical Epidemiology Unit; Office for Research and Development; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
3. Department of Biochemistry; Faculty of Medicine; Chiang Mai University; Chiang Mai Thailand
4. Thalassemia Center and Division of Pediatric Hematology and Oncology; Department of Pediatrics; Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand