1. Department of Otolaryngology‐Head and Neck Surgery Johns Hopkins School of Medicine Baltimore MD
2. Division of Otolaryngology, Department of Surgery, Brigham and Women's Hospital Harvard Medical School Boston MA
3. Department of Environmental Health Sciences Johns Hopkins Bloomberg School of Public Health Baltimore MD
4. Department of Global Health The Peking University School of Public Health Beijing China
5. Institute for Global Health and Development Peking University Beijing China