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Jichi Med Univ, Sch Med, Dept Obstet & Gynecol, 3311 1 Yakushiji, Shimotsuke, Tochigi 3290498, Japan
Koga Red Hosp, Dept Obstet & Gynecol, 1150 Shimoyama, Koga, Ibaraki 3060014, Japan Jichi Med Univ, Sch Med, Dept Obstet & Gynecol, 3311 1 Yakushiji, Shimotsuke, Tochigi 3290498, Japan