1. Departments of Psychiatry and Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
2. Deafness and Family Communication Center, Children's Seashore House of The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
3. Annenberg School of Communication, University of Pennsylvania, Philadelphia, Pennsylvania
4. Deafness and Family Communication Center, Children's Seashore House of The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania