1. Department of Nuclear Medicine, Würzburg University Hospital, University of Würzburg, Oberdürrbacher Straße 6, D-97080 Würzburg, Germany
2. Division of Endocrinology and Diabetes, Department of Medicine I, Würzburg University Hospital, University of Würzburg, Oberdürrbacher Straße 6, D-97080 Würzburg, Germany