AUTHOR=Piotrkiewicz Maria , Hausmanowa-Petrusewicz Irena TITLE=Amyotrophic lateral sclerosis: a dying motor unit? JOURNAL=Frontiers in Aging Neuroscience VOLUME=5 YEAR=2013 URL=https://www.frontiersin.org/journals/aging-neuroscience/articles/10.3389/fnagi.2013.00007 DOI=10.3389/fnagi.2013.00007 ISSN=1663-4365