AUTHOR=Shaffer Fred , Meehan Zachary M. TITLE=Corrigendum: A Practical Guide to Resonance Frequency Assessment for Heart Rate Variability Biofeedback JOURNAL=Frontiers in Neuroscience VOLUME=14 YEAR=2020 URL=https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2020.627512 DOI=10.3389/fnins.2020.627512 ISSN=1662-453X