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Pieta M, Boczarska-Jedynak M, Byrski M, Ochudło S, Pawlas N, Opala G, Hartleb M.Pieta M, et al. Among authors: opala g.Wiad Lek. 2007;60(3-4):189-91.Wiad Lek. 2007.PMID: 17726875Polish.