1 Department of Neuropediatrics and Muscular Disease, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Germany. Electronic address: julia.jacobs@gmx.de.
2 Department of Neuropediatrics and Muscular Disease, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Germany; Berta-Ottenstein-Programme, Faculty of Medicine, University of Freiburg, Germany.