AUTHOR=Stengel Andreas , Malek Nisar , Zipfel Stephan , Goepel Siri TITLE=Long Haulers—What Is the Evidence for Post-COVID Fatigue? JOURNAL=Frontiers in Psychiatry VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2021.677934 DOI=10.3389/fpsyt.2021.677934 ISSN=1664-0640