The impact of folic acid supplementation in early to mid-pregnancy on the risk of hypertensive disorders of pregnancy: the Japan environment and children's study.

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Title: The impact of folic acid supplementation in early to mid-pregnancy on the risk of hypertensive disorders of pregnancy: the Japan environment and children's study.
Authors: Oku A; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan., Saito Y; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan. m010067d@yahoo.co.jp., Iwata H; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan., Itoh S; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan., Hosokawa A; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan., Yamaguchi T; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan., Itoh M; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan., Makino K; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan., Tojo M; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan., Watari H; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan., Ito Y; Faculty of Nursing, Japanese Red Cross Hokkaido College of Nursing, 664-1 Akebono-Cho, Kitami, 090-0011, Japan., Saijo Y; Department of Social Medicine, Asahikawa Medical University, 1-1-1 Midorigaoka-Higashi-2-Jo, Asahikawa, 078-8510, Japan., Kishi R; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.
Corporate Authors: Japan Environment, Children’s Study (JECS) Group
Source: BMC pregnancy and childbirth [BMC Pregnancy Childbirth] 2026 Mar 06; Vol. 26 (1). Date of Electronic Publication: 2026 Mar 06.
Publication Type: Journal Article
Journal Info: Publisher: BioMed Central Country of Publication: England NLM ID: 100967799 Publication Model: Electronic Cited Medium: Internet ISSN: 1471-2393 (Electronic) Linking ISSN: 14712393 NLM ISO Abbreviation: BMC Pregnancy Childbirth Subsets: MEDLINE
Database: MEDLINE Ultimate
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  Data: The impact of folic acid supplementation in early to mid-pregnancy on the risk of hypertensive disorders of pregnancy: the Japan environment and children's study.
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  Data: <searchLink fieldCode="AU" term="%22Oku+A%22">Oku A</searchLink>; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan.<br /><searchLink fieldCode="AU" term="%22Saito+Y%22">Saito Y</searchLink>; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan. m010067d@yahoo.co.jp.<br /><searchLink fieldCode="AU" term="%22Iwata+H%22">Iwata H</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.<br /><searchLink fieldCode="AU" term="%22Itoh+S%22">Itoh S</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.<br /><searchLink fieldCode="AU" term="%22Hosokawa+A%22">Hosokawa A</searchLink>; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan.<br /><searchLink fieldCode="AU" term="%22Yamaguchi+T%22">Yamaguchi T</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.<br /><searchLink fieldCode="AU" term="%22Itoh+M%22">Itoh M</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.<br /><searchLink fieldCode="AU" term="%22Makino+K%22">Makino K</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.<br /><searchLink fieldCode="AU" term="%22Tojo+M%22">Tojo M</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.<br /><searchLink fieldCode="AU" term="%22Watari+H%22">Watari H</searchLink>; Department of Obstetrics and Gynecology, Hokkaido University Graduate School of Medicine, North-12, West-5, Kita-Ku, Sapporo, 060-8648, Japan.<br /><searchLink fieldCode="AU" term="%22Ito+Y%22">Ito Y</searchLink>; Faculty of Nursing, Japanese Red Cross Hokkaido College of Nursing, 664-1 Akebono-Cho, Kitami, 090-0011, Japan.<br /><searchLink fieldCode="AU" term="%22Saijo+Y%22">Saijo Y</searchLink>; Department of Social Medicine, Asahikawa Medical University, 1-1-1 Midorigaoka-Higashi-2-Jo, Asahikawa, 078-8510, Japan.<br /><searchLink fieldCode="AU" term="%22Kishi+R%22">Kishi R</searchLink>; Center for Environmental and Health Sciences, Hokkaido University, North-12, West-7, Kita-Ku, Sapporo, 060-0812, Japan.
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  Data: <searchLink fieldCode="JN" term="%22100967799%22">BMC pregnancy and childbirth</searchLink> [BMC Pregnancy Childbirth] 2026 Mar 06; Vol. 26 (1). <i>Date of Electronic Publication: </i>2026 Mar 06.
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  Data: <i>Publisher: </i><searchLink fieldCode="PB" term="%22BioMed+Central%22">BioMed Central </searchLink><i>Country of Publication: </i>England <i>NLM ID: </i>100967799 <i>Publication Model: </i>Electronic <i>Cited Medium: </i>Internet <i>ISSN: </i>1471-2393 (Electronic) <i>Linking ISSN: </i><searchLink fieldCode="IS" term="%2214712393%22">14712393 </searchLink><i>NLM ISO Abbreviation: </i>BMC Pregnancy Childbirth <i>Subsets: </i>MEDLINE
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        Value: 10.1186/s12884-026-08898-5
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        Text: English
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              Text: 2026 Mar 06
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