1. Rett Expertise Center Netherlands–GKC, Maastricht University Medical Center, Maastricht, The Netherlands
2. Department of Speech-Language Pathology, School of Education, Monmouth University, West Long Branch, NJ, USA
3. Social and Global Studies Centre, School of Global, Urban and Social Studies, RMIT University, Melbourne, Australia
4. Swedish National Center for Rett Syndrome and Related Disorders, Frösön, and Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden