Medaimun GmbH, Johns Hopkins University - Department of Neurology, EryDel S.p.A., University of Urbino - Department of Biomolecular Sciences, Goethe University - Department of Pediatrics, Royal Children’s Hospital - Department of Neurology, Leuven University Hospital - Department of Paediatrics, All India Institute of Medical Sciences (AIIMS) - Centre of Excellence & Advanced Research for Childhood Neuro-developmental Disorders & Child Neurology Division, Nizam's Institute of Medical Sciences - Department of Neurology, National Institute of Mental Health and Neurosciences - Department of Neurology, National Institute of Mental Health and Neurosciences - Department of Neurology, Jaslok Hospital and Research Centre - Department of Neurology, Vijaya Hospital - Department of Neurology, Hinduja National Hospital and Research Center - Pediatric Neurology, Amrita Institute of Medical Sciences - Pediatric Neurology, Vijaya Hospital - Department of Neurology, Tel Aviv University - Children's Neurology Clinic, University of Brescia - Child Neurology and Psychiatry Unit, Sapienza University of Rome, University of Oslo - Norwegian National Unit for Newborn Screening, Children’s Memorial Health Institute - Department of Immunology, Hospital Universitario La Paz - Department of Pediatric Neurology, Razi Hospital - Clinical Investigation Center “Neurosciences and Mental Health”, McGovern Medical School - Department of Pediatrics, Cincinnati Children's Hospital Medical Center, Department of Pediatrics, Division of Neurology, University of California, Los Angeles (UCLA) - Department of Neurology, Quince Therapeutics, EryDel S.p.A., University of Nottingham - Paediatric Neurology and Johns Hopkins University - Division of Pediatric Allergy and Immunology