1. From the Weill Cornell Medical College (M.G.K., R.B.D., M.J.R., J.R.K.), New York, NY; Mayo Clinic (D.O.W., J.P.W.), Rochester, MN; Missouri Breaks Industries Res (L.G.B.), Timber Lake, SD; University of Oklahoma Health Sciences Center (E.T.L.), Oklahoma City, OK; and MedStar Research Institute (B.V.H., J.G.U.), Washington, DC.