^○Yuko Takahashi, Tsuyoshi Terashima, Kohei Takehara, Keita Yatsuki, Ippai Nakagawa, Haruka Nishida, Takayuki Ichinose, Chikara Kihira, Haruko Hiraike, Kazunori Nagasaka (Department of Gynecology and Obstetrics, Teikyo University School of Medicine, Japan)