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Johnson E, Carlsen E, Steen TB, Backer Hjorthaug JO, Eriksen MT, Johannessen HO.Johnson E, et al. Among authors: eriksen mt.Acta Obstet Gynecol Scand. 2010 Nov;89(11):1466-72. doi: 10.3109/00016349.2010.519019.Acta Obstet Gynecol Scand. 2010.PMID: 20955101Free article.