1. Telemedicine and Advanced Technology Research Center, Fort Detrick, Maryland.
2. Center for Health Services Research in Primary Care, Veterans Affairs Medical Center, Division of General Internal Medicine, Duke University Medical Center, Durham, North Carolina.
3. Department of Dermatology, Brooke Army Medical Center, Fort Sam Houston, Texas.
4. Center for Health Services Research in Primary Care, Veterans Affairs Medical Center, Durham, North Carolina.
5. Center for Health Services Research in Primary Care, Veterans Affairs Medical Center, Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, North Carolina.