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Quantifying the lifetime circadian rhythm of physical activity: a covariate-dependent functional approach.. Biostatistics.
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2014. Estimating energy expenditure from heart rate in older adults: a case for calibration.. PLoS One. 9(4):e93520.
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2014. Assessing the "physical cliff": detailed quantification of age-related differences in daily patterns of physical activity.. J Gerontol A Biol Sci Med Sci. 69(8):973-9.
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2014.