1Computer Assisted Clinical Medicine, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany, 2NUKEM Isotopes Imaging GmbH, Alzenau, Germany, 3Institute for Biological Interfaces 5, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany, 4Department of Complex Tissue Regeneration, MERLIN Institute for Technology-Inspired Regenerative Medicine, Maastricht University, Maastricht, Netherlands