Affiliation: | (1) Department of Neurosurgery, Tsukuba Medical Center Hospital, Ibaraki, Japan Tel.: +81-297-455111 Fax: +81-297-455050, JP;(2) Department of Pediatrics, Ibaraki Seinan Iryo Center Hospital, Ibaraki, Japan, JP;(3) Department of Pediatrics, Tsukuba Medical Center Hospital, Ibaraki, Japan, JP;(4) Department of Neurosurgery, Ibaraki Seinan Iryo Center Hospital, Ibaraki, Japan, JP;(5) Department of Neurosurgery, University of Tsukuba, Ibaraki, Japan, JP |