1. From the Department of Pediatrics, University of Pittsburgh School of Medicine;
2. Department of Pediatrics, Children's Hospital of Pittsburgh;
3. Department of Communication Science and Disorders, University of Pittsburgh;
4. Department of Audiology and Communication Disorders, Children's Hospital of Pittsburgh;
5. Department of Biostatistics, University of Pittsburgh Graduate School of Public Health;
6. Department of Family Medicine and Clinical Epidemiology, University of Pittsburgh School of Medicine; and
7. Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.