1. Emory University, Atlanta, Georgia, USA.
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
3. Department of Medicine, University of California San Francisco, San Francisco, California, USA.
4. Department of Family and Precentive Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.
5. Division of Infectious Diseases, Emory University School of Medicine, Atlanta, Georgia, USA.
6. Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.