^○Hideaki Tanaka¹, Tomoko Nakamura¹, Reina Sonehara¹, Natuki Miyake¹, Natsuki Nakanisi¹, Tomoko Osuka¹, Maki Gotou¹, Chiyoe Shirota², Hiroo Uchida², Hiroaki Kajiyama¹ (1.Department of Obstetrics and Gynecology, Nagoya University, Aichi, Japan, 2.Department of Pediatric Surgery, Nagoya University, Aichi Japan)

^○Hiroko Murata, Namiko Hashimoto, Norichika Ushioda, Takanori Takayama, Koji Hatta, Ayaka Tanaka, Jiao Shen, Mayuko Miyamoto, Fujihiro Oka, Hiroko Shimura (Department of Obstetrics and Gynecology, Nippon Life Hospital, Japan)

^○Junya Hirayama, Yasushi Mabuchi, Arisa Minamino, Kumiko Nakata, Tomoko Noguchi, Tamaki Yahata, Nami Oota, Sawako Minami, Kazuhiko Ino (Department of Obstetrics and Gynecology, Wakayama Medical University, Wakayama, Japan)

^○Asami Akaishi, Rie Fukuhara, Sonoka Uchida, Kohei Fuchinoue, Yoshihito Yokoyama (Department of Obstetrics and Gynecology, Hirosaki University Graduate School of Medicine, Aomori, Japan)

^○Yuki Koike, Akina Tsuda, Hikari Nebashi, Ria Kim, Kai Nakosai, Junki Onishi, Shin Mori, Haruna Okubo, Kishihito Yamauchi, Masahiro Ezawa, Motoaki Saito, Aikou Okamoto (Department of Obstetrics and Gynecology, The Jikei University, Tokyo, Japan)

^○Atsuko Miyake, Shigenori Hayashi, Keiyo Imaeda, Kenta Masuda, Yusuke Kobayashi, Masaru Nakamura, Daisuke Aoki (Department of Obstetrics and Gynecology, Keio University, Tokyo, Japan)