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APA Citation
Williams, D. P., Jarczok, M. N., Ellis, R. J., Hillecke, T. K., Thayer, J. F., & Koenig, J. (n.d.). two‐week test–retest reliability of the Polar® RS800CX™ to record heart rate variability. Clinical physiology and functional imaging, 37, 776–781. http://access.bl.uk/ark:/81055/vdc_100052929744.0x00002c