1. Department of Histology and Embryology, Medical Faculty, School of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece.
2. Department of Anatomy I, University of Cologne, Cologne, Germany.
3. Privatklinik für Plastische- und Ästhetische Chirurgie, Berlin Wilmersdorf, Germany.
4. Department of Prosthetic Dentistry, School of Dental and Oral Medicine, University of Cologne, Cologne, Germany.
5. Department I of Internal Medicine, Center for Integrated Oncology Aachen Bonn Cologne Duesseldorf, Faculty of Medicine and University Hospital of Cologne, University of Cologne, Cologne, Germany.
6. Department of Neurosurgery, University of Witten/Herdecke, Cologne Merheim Medical Center (CMMC), Cologne, Germany.
7. Department of Anatomy, Akdeniz University, Antalya, Turkey.
8. Department of Anatomy I, University of Cologne, Cologne, Germany,