1. Academic Research Consulting & Services, Health Science Center Libraries, University of Florida, Gainesville, FL, USA.
2. Department of Epidemiology, School of Public Health, West Virginia University, Morgantown, WV, USA.
3. Department of Family and Community Medicine, College of Medicine, The Ohio State University, Columbus, OH, USA.
4. Department of Biostatistics, School of Public Health, West Virginia University, Morgantown, WV, USA.
5. Kaiser Permanente Washington Health Research Institute, Seattle, WA, USA.