1. Department of Otorhinolaryngology and Head and Neck Surgery, Leiden University Medical Center, Leiden, the Netherlands
2. Department of Developmental Psychology, Leiden University, Leiden, the Netherlands3Dutch Foundation for the Deaf and Hard of Hearing Child, Amsterdam, the Netherlands
3. Walaeus Library, Leiden University Medical Center, Leiden, the Netherlands
4. Department of Otorhinolaryngology and Head and Neck Surgery, Leiden University Medical Center, Leiden, the Netherlands5Leiden Institute for Brain and Cognition, Leiden, the Netherlands