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Regular heartbeat dynamics are associated with cardiac health.
Cysarz D, Lange S, Matthiessen PF, Leeuwen Pv. Cysarz D, et al. Am J Physiol Regul Integr Comp Physiol. 2007 Jan;292(1):R368-72. doi: 10.1152/ajpregu.00161.2006. Epub 2006 Sep 14. Am J Physiol Regul Integr Comp Physiol. 2007. PMID: 16973939 Free article.