Makoto Aoki; Soichiro Obata; Manabu Ogoyama; Koki Shimura; Yutaka Iwagoi; Makiko Kasahara; Yui Yoshida; Saya Yamashita; Akihiko Sekizawa; Koji Hashii; Masahiko Nakata; Takeshi Murakoshi; Shinji Katsuragi; Hiroaki Tanaka; Kayo Tanaka; Yoko Sagara; Tatsuya Arakaki; Junichi Hasegawa; the Working group of Maternal Mortality 2025 in the Japan Association of Obstetricians and Gynecologists