AUTHOR=Zheng Rui , Hao Liu , Li Yuanhui , Zhang Tianjiao , Bai Dexiang , Zhang Liqun , Li Dai , Hao Wei TITLE=Commentary: Craving in Opioid Use Disorder: From Neurobiology to Clinical Practice JOURNAL=Frontiers in Psychiatry VOLUME=12 YEAR=2021 URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2021.615921 DOI=10.3389/fpsyt.2021.615921 ISSN=1664-0640