1. Program coordinator, Visually Impaired Program, Children's Hospital, 4480 Oak Street, Vancouver, British Columbia V6H 3V4, Canada;
2. Department of Pediatrics, University of British Columbia, and Visually Impaired Program, Children's Hospital
3. Developmental pediatrics, University of British Columbia, Vancouver, (mailing address: Sunny Hill Health Centre for Children, 3644 Slocan Street, Vancouver, BC V5M 3E8)
4. Pediatrics, University of British Columbia, and head of the Research Consulting Unit, Children's Hospital. Address all correspondence to Ms. Espezel