1 Department of Pediatrics, Endocrinology, Diabetology, Metabolic Diseases and Cardiology of the Developmental Age, Pomeranian Medical University, Szczecin, Poland.
2 Division of Metabolic Diseases, Beatrix Children's Hospital, University Medical Center Groningen, Groningen, 9700RB, Netherlands. Electronic address: a.m.j.van.wegberg@umcg.nl.
3 Internal Medicine Department, University Hospital of Tours, UMR INSERM 1253, Tours, France.
4 Dietmar Hopp Metabolic Center, University Children's Hospital, Heidelberg, Germany.
5 Division of Metabolic Diseases, Beatrix Children's Hospital, University Medical Center Groningen, Groningen, 9700RB, Netherlands.