[1] Osaka Univ, Dept Neuromodulat, Grad Sch Med, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan
[2] Osaka Univ, Dept Neurosurg, Grad Sch Med, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan
[3] Yu Neurosurg Clin, Toyonaka, Osaka 5600083, Japan
[4] Wakayama Med Univ, Clin Study Support Ctr, Wakayama, Wakayama 6418509, Japan
[5] Kansai Rosai Hosp, Dept Neurosurg, Amagasaki, Hyogo 6608511, Japan
[6] Univ Occupat & Environm Hlth, Grad Sch Med, Dept Obstet & Gynecol, Kitakyushu, Fukuoka, Japan
[7] Osaka Univ, Dept Breast & Endocrine Surg, Grad Sch Med, Suita, Osaka 5650871, Japan