1. Department of Neurosurgery, University of Witten/Herdecke, Cologne Merheim Medical Center (CMMC), Cologne, Germany
2. Department of Prosthetic Dentistry, School of Dental and Oral Medicine, University of Cologne, Cologne, Germany
3. Department of Histology and Embryology, Aristotle University Thessaloniki, Greece
4. Department of Anatomy I, University of Cologne, Germany
5. Department of Anatomy, Akdeniz University Faculty of Medicine, Antalya, Turkey