Tanaka, Tomoko, Department of 1Department of Neurosurgery, University of Arkansas for Medical Sciences, USA, Department of Neurosurgery, Arkansas Children’s Hospital, 1 Children’s Way, USANeurosurgery, University of Arkansas for Medical Sciences, 4301 W Markham St, Little Rock, AR 72205 2 Department of Neurosurgery, Arkansas Children’s Hospital, 1 Children’s Way, Little Rock, AR 72202, United States