1. From the Departments of Pharmacology-Toxicology (G.A.R., B.P.R., N.P.R., P.S.), Nuclear Medicine (W.J.G.O., O.C.B.), and Internal Medicine (G.A.R., N.P.R., P.S.), Radboud University Nijmegen Medical Center, Nijmegen, the Netherlands, and Theseus Imaging Corporation (N.S.), Boston, Mass.