1. Department of Biometry and Epidemiology, Medical University of South Carolina, Charleston, South Carolina
2. Department of Medicine, Medical University of South Carolina, Charleston, South Carolina
3. Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, Alabama
4. Department of Medicine, University of Melbourne, Melbourne, Australia
5. Ralph H. Johnson Veterans Affairs Medical Center, Charleston, South Carolina
6. Birmingham Veterans Affairs Medical Center, Birmingham, Alabama