[1] Univ Hosp Southampton NHS Trust, Dept Child Hlth, Southampton, Hants, England
[2] UCI Great Ormond St Inst Child Hlth, Dev Neurosci Unit, London, England
[3] UCI Great Ormond St Inst Child Hlth, Biomed Res Ctr, London, England
[4] Bambino Gesu Pediat Hosp, Dept Neurosci, Rome, Italy
[5] Vall dHebron Univ Hosp, Dept Pediat Neurol, Barcelona, Spain
[6] Klinikum Kassel, Dept Pediat Neurol, Kassel, Germany
[7] BresMed Hlth Solut, Sheffield, S Yorkshire, England
[8] Shire, Global Med Affairs, Zug, Switzerland
[9] Katholieke Univ Leuven, Univ Hosp, Dept Pediat Neurol, Leuven, Belgium
[10] Univ Southampton, Clin & Expt Sci, Southampton, Hants, England