1. Department of Otolaryngology—Head and Neck Surgery Northwestern University Feinberg School of Medicine Chicago Illinois USA
2. Center for Health Services and Outcomes Research Institute for Public Health and Medicine Northwestern University Feinberg School of Medicine Chicago Illinois USA
3. Department of Otorhinolaryngology—Head and Neck Surgery, McGovern Medical School The University of Texas Health Science Center at Houston Houston Texas USA
4. Center for Immunology and Autoimmune Diseases, Institute of Molecular Medicine, McGovern Medical School The University of Texas Health Science Center at Houston Houston Texas USA
5. Department of Otolaryngology—Head and Neck Surgery University of Colorado Anschutz Medical Campus Aurora Colorado USA
6. Department of Ophthalmology Northwestern University Feinberg School of Medicine Chicago Illinois USA
7. Veterans Affairs Health Services Research and Development Service Chicago Illinois USA