1. Department of Epidemiology, Brown University School of Public Health, Providence, Rhode Island, USA
2. Department of Epidemiology, University of Florida Colleges of Public Health & Health Professions and Medicine, Gainesville, Florida, USA
3. Office of Health Affairs, Health Sciences Center, West Virginia University, Morgantown, West Virginia, USA
4. Department of Epidemiology and Biostatistics, School of Public Health, West Virginia University, Morgantown, West Virginia, USA
5. Department of Behavioral Medicine & Psychiatry, West Virginia University, Morgantown, West Virginia, USA