1. Department of Internal Medicine II, Ludwig-Maximilians-University, 81377 Munich, Germany.
2. Center for Drug Research, Pharmaceutical Biology-Biotechnology, Department of Pharmacy, Ludwig-Maximilians-University, 81377 Munich, Germany.
3. Department of Nuclear Medicine, Ludwig-Maximilians-University, 81377 Munich, Germany.
4. Department of Nuclear Medicine, Technical University Munich, 81675 Munich, Germany.