Reliability and Validity of Commercially Available Wearable Devices for Measuring Steps, Energy Expenditure, and Heart Rate: Systematic Review by Fuller, Daniel, Colwell, Emily, Low, Jonathan, Orychock, Kassia, Tobin, Melissa Ann, Simango, Bo, Buote, Richard, Van Heerden, Desiree, Luan, Hui, Cullen, Kimberley, Slade, Logan, Taylor, Nathan G A

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