1. Duke University Medical Center and Durham Veterans Affairs Medical Center, Durham, North Carolina (M.W.L., S.R.S., A.A.L., A.S., T.T.T., A.M.G.)
2. Durham Veterans Affairs Medical Center and Duke University School of Medicine, Durham, North Carolina (D.V.B., K.M.G., J.M.G., J.W.W.)
3. Duke University, Durham, North Carolina (A.S.K.)
4. University of North Carolina at Chapel Hill, Chapel Hill, North Carolina (C.D.)
5. Uniformed Services University School of Medicine, Bethesda, Maryland (J.D.L.)
6. Duke University Medical Center, Durham Veterans Affairs Medical Center, and Duke University, Durham, North Carolina (A.M.H.)
7. Durham Veterans Affairs Medical Center, Durham, North Carolina; University of California, Davis, Davis, California (M.G.V.)
8. Durham Veterans Affairs Medical Center, Duke University School of Medicine, and Duke University, Durham, North Carolina (H.B.B.)