1. Department of Internal Medicine, Weiss Memorial Hospital, Chicago, Illinois, USA
2. Department of Internal Medicine, Texas Tech University Health Science Center, Lubbock, Texas, USA
3. Department of Internal Medicine, Mount Auburn Hospital/Harvard Medical School, Cambridge, Massachusetts, USA
4. Department of Internal Medicine, Einstein Medical Center, Philadelphia, Pennsylvania, USA
5. Immunology Unit, Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
6. Department of Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
7. Department of Cardiovascular Medicine, Virginia Commonwealth University, Richmond, Virginia, USA