[1] Juntendo Univ, Shizuoka Hosp, Dept Neurosurg, Shizuoka 4102295, Japan
[2] Juntendo Univ, Shizuoka Hosp, Dept Radiol, Shizuoka 4102295, Japan
[3] Juntendo Casualty Ctr, Shizuoka, Japan
[4] Natl Inst Genet, Genet Strains Res Ctr, Mammalian Genet Lab, Shizuoka, Japan