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Holzman, Jacob B.; Bridgett, David J. . (2017). Heart rate variability indices as bio-markers of top-down self-regulatory mechanisms: A meta-analytic review. Neuroscience & Biobehavioral Reviews, 74(), 233–255. doi:10.1016/j.neubiorev.2016.12.032 
10.1016/j.neubiorev.2016.12.032