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Melzer, Katarina; Schutz, Yves; Soehnchen, Nina; Othenin-Girard, Véronique; Martinez de Tejada, Begoña; Irion, Olivier; Boulvain, Michel; Kayser, Bengt (2010). Effects of recommended levels of physical activity on pregnancy outcomes American Journal of Obstetrics & Gynecology, 202(3), 266.e1-266.e6. Elsevier 10.1016/j.ajog.2009.10.876