1. Division of Otolaryngology Children's Hospital of Philadelphia Philadelphia Pennsylvania U.S.A.
2. Department of Otorhinolaryngology—Head and Neck Surgery Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania U.S.A.
3. Department of Biostatistics, Epidemiology and Informatics University of Pennsylvania Philadelphia Pennsylvania U.S.A.
4. Department of Pediatrics, Children's Hospital of Philadelphia University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania U.S.A.
5. University of Pennsylvania Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania U.S.A.
6. Department of Internal Medicine University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania U.S.A.
7. Center for Health Equity Research and Promotion Philadelphia VA Medical Center Philadelphia Pennsylvania U.S.A.