AUTHOR=Benedetti Fabrizio TITLE=Historical evolution of the scientific investigation of the placebo analgesic effect JOURNAL=Frontiers in Pain Research VOLUME=3 YEAR=2022 URL=https://www.frontiersin.org/journals/pain-research/articles/10.3389/fpain.2022.961304 DOI=10.3389/fpain.2022.961304 ISSN=2673-561X