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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">akusherstvo</journal-id><journal-title-group><journal-title xml:lang="en">Obstetrics, Gynecology and Reproduction</journal-title><trans-title-group xml:lang="ru"><trans-title>Акушерство, Гинекология и Репродукция</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2313-7347</issn><issn pub-type="epub">2500-3194</issn><publisher><publisher-name>IRBIS LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17749/2313-7347/ob.gyn.rep.2020.104</article-id><article-id custom-type="elpub" pub-id-type="custom">akusherstvo-827</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Original articles</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ ИССЛЕДОВАНИЯ</subject></subj-group></article-categories><title-group><article-title>Seasonal prematurity, perinatal mortality and deficiency of serum folic acid in pregnant women</article-title><trans-title-group xml:lang="ru"><trans-title>Сезонность недоношенности, перинатальной смертности и дефицита фолиевой кислоты в крови беременных</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6451-5861</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гасанова</surname><given-names>Н. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Gasanova</surname><given-names>N. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Гасанова Назакет Джаббар Кызы - диссертант кафедры акушерства и гинекологии Азербайджанского государственного института усовершенствования врачей имени Азиза Алиева; директор Гянджинского регионального перинатального центра.AZ 1012 Баку, Тбилисский проспект, квартал 3165; AZ 2023 Гянджа, Мамед Халафов, д. 8.</p></bio><bio xml:lang="en"><p>Nazaket D. Gasanova - MD., Dissertator, Department of Obstetrics and Gynecology, Aziz Aliev Azerbaijan State Advanced Training Institute for Doctors; Director of Gyanja Regional Perinatal Center.3165 Tbilisi Ave., Baku AZ 1012; 8 Mamed Khalafov, Gyanja AZ 2023.</p></bio><email xlink:type="simple">mirmmms@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Азербайджанский государственный институт усовершенствования врачей имени Азиза Алиева; Гянджинский региональный перинатальный центр</institution><country>Азербайджан</country></aff><aff xml:lang="en"><institution>Aziz Aliev Azerbaijan State Advanced Training Institute for Doctors; Gyanja Regional Perinatal Center</institution><country>Azerbaijan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>22</day><month>11</month><year>2020</year></pub-date><volume>14</volume><issue>5</issue><fpage>568</fpage><lpage>576</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Gasanova N.D., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Гасанова Н.Д.</copyright-holder><copyright-holder xml:lang="en">Gasanova N.D.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.gynecology.su/jour/article/view/827">https://www.gynecology.su/jour/article/view/827</self-uri><abstract/><trans-abstract xml:lang="ru"/><kwd-group xml:lang="ru"><kwd>сезон</kwd><kwd>недоношенность</kwd><kwd>мертворождаемость</kwd><kwd>перинатальная смертность</kwd></kwd-group><kwd-group xml:lang="en"><kwd>season</kwd><kwd>prematurity</kwd><kwd>stillbirth</kwd><kwd>perinatal mortality</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Lam D.A., Miron J.A. 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