[1] Hokkaido Univ Hosp, Dept Gynecol, Sapporo, Japan
[2] Hokkaido Univ, Dept Obster & Gynecol, Sch Med, Sapporo, Japan
[3] Univ Penn, Sch Vet Med, Biomed Sci, Philadelphia, PA USA
[4] Jikei Univ, Dept Obstet & Gynecol, Tokyo, Japan
[5] Int Univ Hlth & Welf, Dept Obstet & Gynecol, Narita, Japan
[6] Natl Canc Ctr Hosp East, Dept Med Oncol, Kashiwa, Japan
[7] Osaka Univ, Dept Obstet & Gynecol, Suita, Japan
[8] Tohoku Med & Pharmaceut Univ, Dept Obstet & Gynecol, Sendai, Japan
[9] Keio Univ, Dept Gynecol Oncol, Sch Med, Tokyo, Japan
[10] Niigata Univ, Dept Obstet & Gynecol, Grad Sch Med & Dent Sci, Niigata, Japan
[11] Fujita Hlth Univ, Dept Obstet & Gynecol, Toyoake, Japan
[12] Hirosaki Univ, Dept Obstet & Gynecol, Hirosaki, Japan
[13] Natl Hosp Org Shikoku Canc Ctr, Dept Gynecol Oncol, Matsuyama, Japan