1. Department of Neurosurgery University Medical Center Freiburg, Faculty of Medicine University of Freiburg Freiburg Germany
2. Institute of Analytical and Bioanalytical Chemistry Ulm University Ulm Germany
3. Institute of Orthopedic Research and Biomechanics, Centre for Trauma Research Ulm (ZTF Ulm) Ulm University Ulm Germany
4. Department of Ophthalmology Massachusetts Eye and Ear, Harvard Medical School Boston Massachusetts USA