[1] Osaka Med & Pharmaceut Univ, Dept Obstet & Gynecol, Takatsuki, Japan
[2] Osaka Med & Pharmaceut Univ, Dept Neurosurg, Takatsuki, Japan
[3] Kyoto Univ, Inst Integrated Radiat & Nucl Sci, Asasiro Nishi,Kumatori Cho, Kyoto, Japan
[4] Osaka Med & Pharmaceut Univ, Dept Obstet & Gynecol, 2-7 Daigaku Machi, Takatsuki, Osaka 5690801, Japan