1. Department of Pediatrics, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
2. Harvard Medical School, Harvard University, Boston, Massachusetts, USA
3. Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
4. Department of Medicine, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand
5. Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA