1. Division of Otolaryngology—Head and Neck Surgery, Department of Surgery Yale University School of Medicine New Haven Connecticut USA
2. Department of Otolaryngology School of Medicine, University of Pittsburgh Pittsburgh Pennsylvania U.S.A.
3. Department of Otolaryngology—Head and Neck Surgery Johns Hopkins School of Medicine Baltimore Maryland U.S.A.
4. Department of Biostatistics School of Public Health, University of Pittsburgh Pittsburgh Pennsylvania U.S.A.
5. Department of Acute and Tertiary Care, School of Nursing University of Pittsburgh Pittsburgh Pennsylvania U.S.A.