1. Otolaryngology and Facial Plastic Surgery Associates Fort Worth Texas U.S.A
2. Department of Otolaryngology–Head and Neck Surgery Philadelphia College of Osteopathic Medicine Philadelphia Pennsylvania U.S.A
3. Department of Otolaryngology–Head and Neck Surgery The Pennsylvania State University Hershey Pennsylvania U.S.A
4. Department of Otolaryngology Head and Neck Surgery Loma Linda University Medical Center Loma Linda California U.S.A.