1. Department of Neurosurgery, Tokyo Metropolitan Neurological Hospital, Fuchu, Tokyo, Japan
2. Department of Neurosurgery, Tokyo Metropolitan Matsuzawa Hospital, Tokyo, Japan
3. Department of General Pediatrics, Tokyo Metropolitan Children's Medical Center, Fuchu, Tokyo, Japan
4. Department of Neuropediatrics, Tokyo Metropolitan Neurological Hospital, Fuchu, Tokyo, Japan
5. Laboratory Medicine and Pathology, Tokyo Metropolitan Neurological Hospital, Fuchu, Tokyo, Japan