1. Department of Internal Medicine, Piedmont Athens Regional Medical Center, Athens, GA 30606, USA
2. Department of Epidemiology, University of Nebraska Medical Center, Omaha, NE 68198, USA
3. Department of Environmental & Occupational Health, Texas A&M University of Science & Technology, College Station, TX 77843, USA
4. Medical College of Georgia at Augusta University, University of Georgia, Athens, GA 30912, USA
5. Department of Internal Medicine, Rochester Regional Health, Rochester, NY 14617, USA
6. Department of Cardiology, Montefiore Medical Center, Bronx, NY 10467, USA