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Jichi Med Univ, Dept Obstet & Gynecol, 3311-1 Yakushiji, Shimotsuke, Tochigi 3290498, Japan
Koga Red Cross Hosp, Dept Obstet & Gynecol, 1150 Shimoyama, Koga, Ibaraki 3060014, Japan
Ibaraki Western Med Ctr, Med Examinat Ctr, 555 Otsuka, Chikusei, Ibaraki 3080813, Japan Jichi Med Univ, Dept Obstet & Gynecol, 3311-1 Yakushiji, Shimotsuke, Tochigi 3290498, Japan