1. Department of Otolaryngology–Head and Neck Surgery, School of Medicine The University of Texas Rio Grande Valley Edinburg Texas USA
2. Department of Otolaryngology–Head and Neck Surgery University of California–San Francisco San Francisco California USA
3. Department of Otolaryngology–Head and Neck Surgery Harvard Medical School Cambridge Massachusetts USA
4. Department of Otolaryngology–Head and Neck Surgery University of Michigan Medical School Ann Arbor Michigan USA
5. Department of Otolaryngology–Head and Neck Surgery Lewis Katz School of Medicine at Temple University Philadelphia Pennsylvania USA