1. Department of Plastic and Reconstructive Surgery and Burns, Faculty of Medicine; University of Alexandria; Alexandria Egypt
2. Department of Hand, Plastic, and Reconstructive Surgery, BG Trauma Center Ludwigshafen; University of Heidelberg; Heidelberg Germany
3. Head, Neck and Endocrine Surgery Unit, Department of Surgery, Faculty of Medicine; University of Alexandria; Alexandria Egypt
4. Department of Radiation Oncology; University Hospital of Heidelberg; Heidelberg Germany