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Williams DP, Koenig J, Carnevali L, et al. (August 2019). "Heart rate variability and inflammation: A meta-analysis of human studies". Brain Behav. Immun. 80: 219–226. doi:10.1016/j.bbi.2019.03.009. PMID30872091. S2CID78091147.
Zabrodskiĭ, PF (1995). "Variation in antiinfectious nonspecific resistance of the organism caused by cholinergic stimulation". Bulletin of Experimental Biology and Medicine. 120 (2): 809–811. doi:10.1007/BF02445960. S2CID31513646.
Thayer JF, Ahs F, Fredrikson M, et al. (December 2012). "A meta-analysis of heart rate variability and neuroimaging studies: implications for heart rate variability as a marker of stress and health". Neurosci Biobehav Rev. 36 (2): 747–756. doi:10.1016/j.neubiorev.2011.11.009. PMID22178086. S2CID2512272.
Williams DP, Koenig J, Carnevali L, et al. (August 2019). "Heart rate variability and inflammation: A meta-analysis of human studies". Brain Behav. Immun. 80: 219–226. doi:10.1016/j.bbi.2019.03.009. PMID30872091. S2CID78091147.