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Kaasen A, Tuveng J, Heiberg A, Scott H, Haugen G.Kaasen A, et al. Among authors: heiberg a.Ultrasound Obstet Gynecol. 2006 Dec;28(7):925-33. doi: 10.1002/uog.3871.Ultrasound Obstet Gynecol. 2006.PMID: 17121414Free article.
von Tetzchner S, Jacobsen KH, Smith L, Skjeldal OH, Heiberg A, Fagan JF.von Tetzchner S, et al. Among authors: heiberg a.Dev Med Child Neurol. 1996 Mar;38(3):212-25. doi: 10.1111/j.1469-8749.1996.tb15083.x.Dev Med Child Neurol. 1996.PMID: 8631518
Thommessen M, Heiberg A, Kase BF.Thommessen M, et al. Among authors: heiberg a.Eur J Clin Nutr. 1992 Jul;46(7):457-64.Eur J Clin Nutr. 1992.PMID: 1623850