1. From the University of Missouri-Columbia (Y.W., A.T.W.-C., K.C., J.H., G.M.-E.U., S.E.C., J.R.S.), and the Harry S. Truman VA Medical Center (Y.W., A.T.W.-C., J.H., S.E.C., J.R.S.), Columbia, Mo; Tucson Arizona VA Medical Center (C.S.S.); and the Bowman Gray School of Medicine at Wake Forest University (C.M.F.), Winston-Salem, NC.