1. Multiple pregnancy, short cervix, part‐time worker, steroid use, low educational level and male fetus are risk factors for preterm birth in Japan: A multicenter, prospective study. Issue 1 (12th August 2013) Authors: Shiozaki, Arihiro; Yoneda, Satoshi; Nakabayashi, Masao; Takeda, Yoshiharu; Takeda, Satoru; Sugimura, Motoi; Yoshida, Koyo; Tajima, Atsushi; Manabe, Mami; Akagi, Kozo; Nakagawa, Shoko; Tada, Katsuhiko; Imafuku, Noriaki; Ogawa, Masanobu; Mizunoe, Tomoya; Kanayama, Naohiro; Itoh, Hiroaki; Minoura, S... Journal: Journal of obstetrics and gynaecology research Issue: Volume 40:Issue 1(2014:Jan.) Page Start: 53 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗