AUTHOR=Chen Maoqi , Bashford James , Zhou Ping TITLE=Motor Unit Number Estimation (MUNE) Free of Electrical Stimulation or M Wave Recording: Feasibility and Challenges JOURNAL=Frontiers in Aging Neuroscience VOLUME=14 YEAR=2022 URL=https://www.frontiersin.org/journals/aging-neuroscience/articles/10.3389/fnagi.2022.799676 DOI=10.3389/fnagi.2022.799676 ISSN=1663-4365