1. University of Pittsburgh Cleft Palate Center and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pa
2. Departments of Otolaryngology and Audiology, University of Toronto, Toronto, Canada
3. University of Pittsburgh Cleft Palate Center and Department of Otolaryngology, University of Pittsburgh School of Medicine, Pittsburgh, Center for Handicapped Children, University of Illinois, Chicago, Ill
4. University of Pittsburgh Cleft Palate Center and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pa, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Md
5. Department of Otolaryngology, University of Pennsylvania School of Medicine, Philadelphia, Pa