AUTHOR=Van Weperen Valerie Y. H. , Vos Marc A. , Van der Heyden Marcel A. G. TITLE=Commentary: Autonomic Modulation in Patients with Heart Failure Increases Beat-to-Beat Variability of Ventricular Action Potential Duration JOURNAL=Frontiers in Physiology VOLUME=8 YEAR=2017 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2017.00459 DOI=10.3389/fphys.2017.00459 ISSN=1664-042X