AUTHOR=Billman George E. TITLE=The LF/HF ratio does not accurately measure cardiac sympatho-vagal balance JOURNAL=Frontiers in Physiology VOLUME=4 YEAR=2013 URL=https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2013.00026 DOI=10.3389/fphys.2013.00026 ISSN=1664-042X