9 Four cases of the torsion of ovarian tumor over twenty weeks of gestation Department of Obstetrics and Gynecology, Juntendo Shizuoka Hospital Keisuke MURAKAMI, Atsuko YAMADA, Tamito MIKI, Takashi YAMAGUCHI, Machiko SUGANUMA, Saori TANAKA, Yumiko MURAOKA, Toshitaka TANAKA, Yuko IGARASHI, Takeshi TAGUCHI, Naoki Mitsuhashi
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