1. RTI International–University of North Carolina at Chapel Hill Evidence-based Practice Center
2. Department for Evidence-based Medicine and Clinical Epidemiology, Danube University Krems, Krems, Austria
3. RTI International, Research Triangle Park, North Carolina
4. Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill
5. Department of Medicine, University of North Carolina at Chapel Hill
6. Eshelman School of Pharmacy, University of North Carolina at Chapel Hill