Association between pre-pregnancy calcium intake and hypertensive disorders during the first pregnancy: the Japan environment and children's study by Hyo Kyozuka, Tsuyoshi Murata, Toma Fukuda, Akiko Yamaguchi, Aya Kanno, Shun Yasuda, Akiko Sato, Yuka Ogata, Masahito Kuse, Mitsuaki Hosoya, Seiji Yasumura, Koichi Hashimoto, Hidekazu Nishigori, Keiya Fujimori, Japan Environment and Children's Study (JECS)

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