1. Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology–Head and Neck Surgery, Massachusetts Eye and Ear Harvard Medical School Boston Massachusetts USA
2. Department of Surgery University Teaching Hospital of Kigali Kigali Rwanda
3. Department of Oral and Maxillofacial Surgery, Faculty of Health Sciences University of Zimbabwe Harare Zimbabwe
4. Departments of Oral and Maxillofacial Surgery/Dental and Maxillofacial Surgery, Faculty of Dental Sciences Usmanu Danfodiyo University/Usmanu Danfodiyo University Teaching Hospital Sokoto Nigeria