1. Department of Pharmaceutics and Biopharmacy, Philipps-Universität Marburg, Ketzerbach 63, 35037 Marburg, Germany, Department of Nuclear Medicine, University Hospital Giessen and Marburg GmbH, Baldingerstrasse, 35043 Marburg, Germany, and Department of Nuclear Medicine, University of Freiburg, Hugstetterstrasse 55, 79106 Freiburg, Germany