Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review.
JMIR Mhealth Uhealth. 2020 Sep 8;8(9):e18694. doi: 10.2196/18694.
JMIR Mhealth Uhealth. 2020.
PMID: 32897239
Free PMC article.