1. Department of Internal Medicine; Bassett Medical Center and Columbia University College of Physicians and Surgeons; Cooperstown New York USA
2. Department of Preventive and Social Medicine, Faculty of Medicine, Siriraj Hospital; Mahidol University; Bangkok Thailand
3. Department of Internal Medicine; University of Hawaii; Honolulu Hawaii USA
4. Department of Internal Medicine; King Chulalongkorn Memorial Hospital; Bangkok Thailand