1. Department of Otolaryngology–Head and Neck Surgery Indiana University School of Medicine Indianapolis Indiana U.S.A.
2. Department of Epidemiology Indiana University‐Purdue University Indianapolis Indiana U.S.A.
3. Department of Otolaryngology‐Head and Neck Surgery University of Louisville Louisville Kentucky U.S.A.
4. Division of Otolaryngology‐Head and Neck Surgery Cedars‐Sinai Medical Center, Los Angeles Los Angeles California U.S.A.