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However, an analysis of preterm births in Sweden from 1973 to 1979 shows that the number of both preterm births before week 32 and of infants with birthweight below 1 500 g is declining, which is more interesting in terms of fetal outcome than is the crude preterm figure (before week 37). The introduction of routine use of \u03b2\u2010receptor agonists for preterm labor coincides with this decrease.<\/jats:p><jats:p>It is concluded that these drugs can be of great value in many obstetrical situations.<\/jats:p>","DOI":"10.3109\/00016348209155340","type":"journal-article","created":{"date-parts":[[2009,12,8]],"date-time":"2009-12-08T18:01:02Z","timestamp":1260295262000},"page":"29-34","update-policy":"http:\/\/dx.doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Use of \u03b2\u2010Receptor Agonists in Obstetrics"],"prefix":"10.1111","volume":"61","author":[{"given":"Ingemar","family":"Ingemarsson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2011,1,11]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(75)90459-7"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.3109\/00016347509156750"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.1975.tb00716.x"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(78)90471-4"},{"key":"e_1_2_1_6_1","first-page":"22","article-title":"Terbutaline sulfate in the prevention of recurrence of premature labor","volume":"57","author":"Brown S. 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Proceedings of an International Symposium: The Treatment of Fetal Risks Baden Austria May 11\u2013131972 K.Baumgarten A.Weselius de Casparis.University of Vienna (Medical School Second Department of Obstetrics and Gynaecology) Vienna 145."},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/0002-9378(79)90885-8"},{"key":"e_1_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1471-0528.1978.tb14906.x"},{"key":"e_1_2_1_16_1","unstructured":"IngemarssonI..Inhibition of Myometrial Activity During Human Pregnancy by \u03b2\u2010adrenoceptor Stimulation.Thesis The University of Lund.1975."},{"key":"e_1_2_1_17_1","doi-asserted-by":"crossref","first-page":"320","DOI":"10.1016\/0002-9378(76)90369-0","article-title":"Effect of terbutaline on premature labor. 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