1. Department of Paediatrics and Adolescent MedicineCenter for Rett Syndrome, Rigshospitalet Copenhagen Denmark
2. Kennedy Center, Department of Clinical GeneticsCopenhagen University Hospital, Rigshospitalet Copenhagen Denmark
3. Department of Clinical GeneticsCopenhagen University Hospital, Rigshospitalet Copenhagen Denmark
4. Department of PediatricsKolding Hospital Kolding Denmark
5. Hans Christian Andersen Children's HospitalOdense University Hospital Odense Denmark
6. Medical Genetics DepartmentNational and Kapodistrian University of Athens, “Aghia Sophia” Children's Hospital Athens Greece
7. Department of Medical Genetics, Hacettepe Medical School Ankara Turkey
8. Department of Paediatrics, Murdoch Children's Research InstituteUniversity of Melbourne Melbourne Australia
9. Department of Clinical GeneticsOdense University Hospital Odense Denmark
10. Department of Clinical MedicineFaculty of Health and Medical Sciences, University of Copenhagen Copenhagen Denmark