1. Department of Internal Medicine, Griffin Hospital, Derby, Connecticut, USA
2. Department of Internal Medicine, Texas Tech University Health Science Center, Lubbock, Texas, USA
3. Cardiovascular Services, Mayo Clinic, Phoenix, Arizona, USA
4. Department of Microbiology, Chiang Mai University Faculty of Medicine, Chiang Mai, Thailand
5. Faculty of Medicine, King Chulalongkorn Memorial Hospital, Bangkok, Thailand
6. Department of Internal Medicine, Weiss Memorial Hospital, Chicago, Illinois, USA