1. Department of Otolaryngology‐Head and Neck Surgery Johns Hopkins University School of Medicine Baltimore Maryland U.S.A.
2. Department of Environmental Health and Engineering Johns Hopkins Bloomberg School of Public Health Baltimore Maryland U.S.A.
3. Department of Pulmonary and Critical Care Medicine Johns Hopkins School of Medicine Baltimore Maryland U.S.A.
4. Department of Otolaryngology‐Head and Neck Surgery Vanderbilt University School of Medicine Nashville Tennessee U.S.A.