1. Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology‐Head & Neck Surgery Stanford University School of Medicine Stanford California U.S.A.
2. Department of Otolaryngology‐ Head & Neck Surgery Mansoura University, Faculty of Medicine Mansoura Egypt
3. Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology – Head and Neck Surgery Vanderbilt University Medical Center Nashville Tennessee U.S.A.