Akio Koizumi, Department of Health and Environmental Sciences, Graduate School of Medicine, Kyoto UniversityKazuhiro Nagata, Laboratory of Molecular and Cellular biology, Faculty of Life Sciences, Kyoto Sangyo UniversityKiyohiro Houkin, Department of Neurosurgery, Graduate School of Medicine, Hokkaido UniversityTeiji Tominaga, Department of Neurosurgery, Tohoku University School of Medicine Susumu Miyamoto, Department of Neurosurgery, Graduate School of Medicine, Kyoto UniversityShigeo Kure, Department of Pediatrics, Tohoku University School of MedicineElizabeth Tournier‐Lasserve, CHU Paris‐GH St‐Louis Lariboisière F‐Widal ‐ Hôpital Lariboisière