AUTHOR=O’Brien Myles W. , Pellerine Liam P. , Shivgulam Madeline E. , Kimmerly Derek S. TITLE=Disagreements in physical activity monitor validation study guidelines create challenges in conducting validity studies JOURNAL=Frontiers in Digital Health VOLUME=4 YEAR=2023 URL=https://www.frontiersin.org/journals/digital-health/articles/10.3389/fdgth.2022.1063324 DOI=10.3389/fdgth.2022.1063324 ISSN=2673-253X