1. Department of Otolaryngology – Head and Neck Surgery, Pennsylvania State University, College of Medicine, Hershey, Pennsylvania, USA.
2. Department of Otolaryngology – Head and Neck Surgery, Thomas Jefferson University Hospital, Philadelphia, Pennsylvania, USA.
3. Department of Otolaryngology – Head and Neck Surgery, Mayo Clinic, Rochester, Minnesota, USA.
4. Department of Otolaryngology – Head and Neck Surgery, University of Arkansas for medical sciences, Little Rock, Arkansas, USA
5. Division of Facial Plastic and Reconstructive Surgery, Department of Otolaryngology – Head and Neck Surgery, Pennsylvania State University, College of Medicine, Hershey, Pennsylvania, USA.