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Birkner E, Grucka-Mamczar E, Kasperczyk S, Kasperczyk A, Zalejska-Fiolka J, Birkner B, Pieczyrak B.Birkner E, et al. Among authors: birkner b.Ann Acad Med Stetin. 2004;50 Suppl 1:14-8.Ann Acad Med Stetin. 2004.PMID: 16892577Polish.