Objective Self-reports of physical activity (PA) have been the mainstay of measurement in most non-communicable disease (NCD) surveillance systems. To these, other measures are added to summate to a ...
Correspondence to Dr Barbara J Jefferis, Department of Primary Care & Population Health, University College London Medical School, Rowland Hill Street, London NW3 2PF, UK; b.jefferis{at}ucl.ac.uk ...
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