1. Department of Orthopedics and Traumatology , University Hospital Tsaritsa Ioanna – ISUL, Medical University – Sofia , Bulgaria
2. Department of Anatomy, Histology and Embryology , Medical University – Sofia , Bulgaria
3. Clinic of Orthopedics and Traumatology , UMHAT “Sv. Anna” – Sofia , Bulgaria
4. Department of General and Clinical Pathology, Faculty of Medicine , Trakia University – Stara Zagora , Bulgaria
5. Department of Anatomical Dissection and Donation, Chair of Anatomy and Histology , Medical University – Lodz