1 Department of Paediatric Neurology and Developmental Medicine, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Germany. Electronic address: mirjam.landgraf@med.uni-muenchen.de.
2 Institute for Evidence in Medicine, Faculty of Medicine and Medical Centre, University of Freiburg, Germany.
3 Department of Paediatric Neurology and Developmental Medicine, Dr. von Hauner Children's Hospital, Ludwig-Maximilians-University of Munich, Germany.
4 Association of the Scientific Medical Societies in Germany (AWMF), Berlin, Germany.