1. From the Departments of Pediatrics (A.H., J.L.P., M.H., D.H.K., S.B., G.B.M.P., T.R.S., J.M.M., M.K.-L., H.L., K.Y., J.P.N., N.S.) and Otolaryngology (D.H.C., J.E.D.), University of Pittsburgh School of Medicine, UPMC Children’s Hospital of Pittsburgh, the Department of Biostatistics, University of Pittsburgh Graduate School of Public Health (J.-H.J.), and Children’s Community Pediatrics (N.L.C., B.C.) — all in Pittsburgh; Children’s National Medical Center, Washington, DC (D.P., D.E.F.); and Kentucky...