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Walczewska A, Stępień T, Bewicz-Binkowska D, Zgórzyńska E.Walczewska A, et al. Among authors: stepien t.Postepy Hig Med Dosw (Online). 2011 Jun 2;65:314-27. doi: 10.5604/17322693.945763.Postepy Hig Med Dosw (Online). 2011.PMID: 21677356Free article.Review.Polish.