1. Department of Nuclear Medicine, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
2. Department of Nuclear Medicine, Inselspital, Bern University Hospital, Bern, Switzerland
3. Chair for Computer-Aided Medical Procedures and Augmented Reality, Technical University of Munich, Garching near Munich, Germany
4. Department of diagnostic and interventional Radiology and Neuroradiology, University Hospital Augsburg, Augsburg, Germany