1. High-Field Magnetic Resonance Center, Max Planck Institute for Biological Cybernetics, Max-Planck-Ring 11, 72076 Tübingen, Germany
2. Physikalisches Institut and Center for Quantum Science (CQ) in LISA+, University of Tübingen, Tübingen, Germany
3. Department for Biometrics and Medical Informatics, Otto-von-Guericke University, Magdeburg, Germany