1. Division of Cardiology, Department of Medicine, Faculty of Medicine; Chulalongkorn University and King Chulalongkorn Memorial Hospital; Bangkok Thailand
2. King Chulalongkorn Memorial Hospital; Thai Red Cross Society; Bangkok Thailand
3. Department of Internal Medicine; Bassett Medical Center; Cooperstown New York USA
4. Department of Internal Medicine; St Elizabeth's Medical Center; Boston Massachusetts USA
5. Division of Cardiology, Department of Medicine; University of Mississippi Medical Center; Jackson Mississippi USA
6. Division of Nephrology, Department of Medicine; University of Mississippi Medical Center; Jackson Mississippi USA