[This corrects the article DOI: 10.3389/fphys.2018.00424.].
Keywords: adults; children; elderly; electrocardiography; heart-rate correction; heart-rate variability; normal values.
Copyright © 2019 van den Berg, Rijnbeek, Niemeijer, Hofman, van Herpen, Bots, Hillege, Swenne, Eijgelsheim, Stricker and Kors.