1. Department of Family Practice, Virginia Commonwealth University, Richmond, Virginia.
2. Northeastern Ohio University College of Medicine, Rootstown, Ohio.
3. Department of Family Medicine, Northeastern Ohio University College of Medicine, Rootstown, Ohio.
4. Regenstreif Institute, Indiana University School of Medicine, Richard L. Roudebush, Veterans Administration Medical Center, Indianapolis, Indiana.
5. Johns Hopkins University, Baltimore, Maryland.
6. Imperial College of Science, Technology, and Medicine, St. Mary's Hospital, London, England.