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Nijveldt R, Beek AM, Hirsch A, Hofman MB, Umans VA, Algra PR, van Rossum AC.Nijveldt R, et al. Among authors: algra pr.Neth Heart J. 2008 May;16(5):179-81. doi: 10.1007/BF03086141.Neth Heart J. 2008.PMID: 18566669Free PMC article.