1. Johns Hopkins University School of Medicine Baltimore Maryland U.S.A.
2. Department of Otolaryngology–Head and Neck Surgery Johns Hopkins University Baltimore Maryland U.S.A.
3. Eudowood Division of Pediatric Respiratory Sciences Johns Hopkins University School of Medicine Baltimore Maryland U.S.A.
4. Biostatistics, Epidemiology and Data Management (BEAD) Core Johns Hopkins School of Medicine Baltimore Maryland U.S.A.
5. Johns Hopkins University School of Medicine Welch Medical Library Baltimore Maryland U.S.A.