[1] Univ Childrens Hosp Zurich, Dept Neuropediat, Zurich, Switzerland
[2] Univ Zurich, Zurich, Switzerland
[3] Hosp Fdn Adolphe de Rothschild, Dept Pediat Neurosurg, Paris, France
[4] Univ Med Ctr Utrecht, UMC Utrecht Brain Ctr, Dept Child Neurol, Utrecht, Netherlands
[5] Univ Utrecht, Utrecht, Netherlands
[6] Great Ormond St & UCL NIHR BRC Great Ormond St In, Great Ormond St Hosp Children NHS Fdn Trust, Dept Neurol, London, England
[7] Univ Freiburg, Dept Neurosurg, Med Ctr, Freiburg, Germany
[8] Great Ormond St Hosp Children NHS Fdn Trust, Dept Neurosurg, Great Ormond St, London, England