1. Division of Endocrinology, Kaiser Permanente of Georgia and Division of Endocrinology, Emory University School of Medicine, Atlanta, Georgia, USA
2. Department of Biostatistics, University of Texas School of Public Health, Houston, Texas, USA
3. Clinical Trial Center, University of Texas School of Public Health, Houston, Texas, USA
4. Department of Epidemiology, University of Kentucky College of Public Health, Lexington, Kentucky, USA