1. Department of Neurology; Yale University School of Medicine; New Haven; Connecticut; U.S.A
2. Department of Neurology; The Johns Hopkins Bayview Medical Center; Baltimore; Maryland; U.S.A
3. Great Ormond Street Hospital for Children; NHS Foundation Trust; London; United Kingdom
4. Department of Neurology; Medical University of Innsbruck; Innsbruck; Austria
5. Department of Neurology; Paracelsus Medical University; Salzburg; Austria