1. From the Departments of Medicine (T. Tang, M.H.G., N.C.L., A.L.F., T. Takahashi, T.G., J.X.-J.Y., H.K.H.) and Anesthesiology (D.M.R.), University of California, San Diego, and VA San Diego Healthcare System (T. Tang, M.H.G., N.C.L., D.M.R., H.K.H.), San Diego, Calif.