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Appropriate definition of childbirth using Japanese administrative database: a cross-sectional cohort validation study.

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Title: Appropriate definition of childbirth using Japanese administrative database: a cross-sectional cohort validation study.
Authors: Koizumi M; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan., Nakajima H; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan. Hiroki.nakajima@naramed-u.ac.jp., Nishioka Y; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan. y_n@naramed-u.ac.jp.; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan. y_n@naramed-u.ac.jp., Morita E; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan., Myojin T; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.; Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine, Shizuoka, Japan., Noda T; Department of Hygiene and Public Health, Kansai Medical University, Osaka, Japan., Imamura T; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan., Takahashi Y; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan.
Source: BMC pregnancy and childbirth [BMC Pregnancy Childbirth] 2026 Feb 11; Vol. 26 (1). Date of Electronic Publication: 2026 Feb 11.
Publication Type: Journal Article; Validation Study
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: <searchLink fieldCode="AU" term="%22Koizumi+M%22">Koizumi M</searchLink>; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan.<br /><searchLink fieldCode="AU" term="%22Nakajima+H%22">Nakajima H</searchLink>; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan. Hiroki.nakajima@naramed-u.ac.jp.<br /><searchLink fieldCode="AU" term="%22Nishioka+Y%22">Nishioka Y</searchLink>; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan. y_n@naramed-u.ac.jp.; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan. y_n@naramed-u.ac.jp.<br /><searchLink fieldCode="AU" term="%22Morita+E%22">Morita E</searchLink>; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.<br /><searchLink fieldCode="AU" term="%22Myojin+T%22">Myojin T</searchLink>; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.; Department of Community Health and Preventive Medicine, Hamamatsu University School of Medicine, Shizuoka, Japan.<br /><searchLink fieldCode="AU" term="%22Noda+T%22">Noda T</searchLink>; Department of Hygiene and Public Health, Kansai Medical University, Osaka, Japan.<br /><searchLink fieldCode="AU" term="%22Imamura+T%22">Imamura T</searchLink>; Department of Public Health, Health Management and Policy, Nara Medical University, 840 Shijo-cho, Kashihara, Nara, 634-8521, Japan.<br /><searchLink fieldCode="AU" term="%22Takahashi+Y%22">Takahashi Y</searchLink>; Department of Diabetes and Endocrinology, Nara Medical University, 840 Shijo- cho, Kashihara, Nara, 634-8522, Japan.
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  Data: <searchLink fieldCode="JN" term="%22100967799%22">BMC pregnancy and childbirth</searchLink> [BMC Pregnancy Childbirth] 2026 Feb 11; Vol. 26 (1). <i>Date of Electronic Publication: </i>2026 Feb 11.
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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/s12884-026-08797-9
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        Text: English
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              Text: 2026 Feb 11
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              Y: 2026
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