1. Department of Epidemiology School of Public Health West Virginia University Morgantown WV USA
2. Cardiorespiratory Center West Virginia University Morgantown WV USA
3. Department of Medicine Division of Endocrinology Vanderbilt University Nashville TN USA
4. Department of Health Promotion and Development School of Nursing University of Pittsburgh Pittsburgh PA USA
5. International Epidemiology Institute Rockville MD USA
6. Department of Medicine Division of Epidemiology Vanderbilt University Nashville TN USA