AUTHOR=Shiina Kenpei TITLE=Commentary: The Historical Roots of Visual Analog Scale in Psychology as Revealed by Reference Publication Year Spectroscopy JOURNAL=Frontiers in Human Neuroscience VOLUME=15 YEAR=2021 URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2021.711691 DOI=10.3389/fnhum.2021.711691 ISSN=1662-5161