1. Faculty of Medicine Siriraj Hospital; Mahidol University; Bangkok Thailand
2. University of Hawaii Internal Medicine Residency Program; Honolulu Hawaii
3. Faculty of Medicine Ramathibodi Hospital; Mahidol University; Bangkok Thailand
4. Phramongkutklao College of Medicine; Bangkok Thailand
5. Department of Pathology; Duke University Medical Center; Durham North Carolina
6. Department of Medicine; Einstein Medical Center; Philadelphia Pennsylvania
7. Department of Medicine; Texas Tech University Health Sciences Center; Lubbock Texas