1. Institute of Radiopharmacy, Forschungszentrum Dresden-Rossendorf, 01314 Dresden, Germany, Department of Radiology and Department of Internal Medicine, University of Missouri−Columbia School of Medicine, Columbia, Missouri 65211, University of Missouri Research Reactor Center, University of Missouri−Columbia, Columbia, Missouri 65211, and Research Division, Harry S. Truman Memorial Veterans' Hospital, Columbia, Missouri 65201