1. Durham VA Health Care System, Durham, and University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (K.D.A.)
2. Durham VA Health Care System, Durham, North Carolina (S.W., D.B., N.J.H.)
3. Durham VA Health Care System and Duke University, Durham, North Carolina (H.M.H., K.S.H., K.M.H., M.C.M., S.R.)
4. Greenville VA Health Care Center, Greenville, North Carolina (J.B.)
5. Duke University, Durham, North Carolina (K.C.)
6. University of Wisconsin, Madison, Wisconsin (B.H.)
7. Oregon Research Institute, Eugene, Oregon (H.S.)
8. Durham VA Health Care System and Duke University School of Medicine, Durham, North Carolina (C.V.)
9. VA Eastern Colorado Health Care System and University of Colorado School of Medicine, Aurora, Colorado (L.M.A.)
10. Durham VA Health Care System and Duke University Medical Center, Durham, North Carolina (C.J.C.).