1. Department of Histology and Embryology, Faculty of Medicine, University of Nis, Serbia
2. Pediatric Surgery and Orthopedic Clinic, Clinical Center Nis, Serbia
3. Department of Physiology, Faculty of Medicine, University of Nis, Serbia
4. Department of Biochemistry, Faculty of Medicine, University of Nis, Serbia
5. Department of Pathology, Faculty of Medicine, University of Nis, Serbia
6. Guy’s and St Thomas’ Hospital and King’s College London, London, UK
7. Plastic Surgery Clinic, Clinical Center Nis, Serbia