Accuracy of consumer-level and research-grade activity trackers in ambulatory settings in older adults Tedesco, Salvatore ; Sica, Marco ; Ancillao, Andrea ; Timmons, Suzanne ; Barton, John ; O'Flynn, Brendan Abstract Publication: PLoS ONE Pub Date: May 2019 DOI: 10.1371/journal.pone.0216891 Bibcode: 2019PLoSO..1416891T