Heart rate variability.
van Ravenswaaij-Arts CM, Kollée LA, Hopman JC, Stoelinga GB, van Geijn HP.
van Ravenswaaij-Arts CM, et al. Among authors: kollee la.
Ann Intern Med. 1993 Mar 15;118(6):436-47. doi: 10.7326/0003-4819-118-6-199303150-00008.
Ann Intern Med. 1993.
PMID: 8439119
Review.