1Dietetic Department, Birmingham Children’s Hospital, Birmingham, UK
2Division of Metabolic Diseases, Beatrix Children’s Hospital, University Medical Centre Groningen, University of Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands
3Department of PKU, Kennedy Centre, Glostrup, Denmark
4Department of Women and Child Health, Center for Pediatric Research Leipzig, Hospital for Children and Adolescents, University Hospitals, Leipzig, Germany
5Department of Paediatrics, Hospital Ramon y Cajal Madrid, Metabolic Diseases Unit, Madrid, Spain
6Division of Inherited Metabolic Diseases, Department of Paediatrics, University Hospital of Padova, Padova, Italy
7Neuropaediatrics Department, Hospital Sant Joan de Déu, Universitat de Barcelona, Barcelona, Spain
8Hacettepe University Faculty of Medicine, Ankara, Turkey
9Department of Paediatrics, Hôpital d’Enfants Brabois, CHU Nancy, Vandoeuvre les Nancy, France
10Department of Paediatrics, Endocrinology, Diabetology, Metabolic Diseases and Cardiology of the Developmental Age, Pomeranian Medical University, Szczecin, Poland
11Department of Clinical Child and Adolescent Studies-Neurodevelopmental Disorders, Faculty of Social Sciences, Leiden University, Leiden, The Netherlands
12Department of Paediatrics, Child Neurology and Psychiatry, Sapienza University of Rome, Via dei Sabelli 108, 00185 Rome, Italy
13CHRU de Tours, Université François Rabelais, INSERM U1069, Tours, France
14University Children’s Hospital, University Medical Centre Hamburg-Eppendorf, 20246 Hamburg, Germany
15Nutrition & Metabolism, NOVA Medical School, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, Lisbon, Portugal. Centre for Health Technology and Services Research (CINTESIS), Porto, Portugal
16School of Life and Health Sciences, Aston University, Birmingham, UK
17Department of Paediatrics, University of Heidelberg, Heidelberg, Germany