1. Department of Otolaryngology-Head and Neck Surgery, University Hospitals, Case Western Reserve University School of Medicine, Cleveland, Ohio
2. Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology-Head and Neck Surgery, Stanford University School of Medicine, Stanford, CA, USA
3. Department of Maxillofacial & Plastic Surgery, Alexandria University, Faculty of Dentistry, Alexandria, Egypt