@article{ref1,
title="Changes in physical activity behavior and risk of falls over 8 years' follow-up: English Longitudinal Study of Aging",
journal="Mayo Clinic proceedings",
year="2019",
author="Smith, Lee and Stubbs, Brendon and Hamer, Mark",
volume="94",
number="2",
pages="365-367",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0025-6196",
doi="10.1016/j.mayocp.2018.11.014",
url="http://dx.doi.org/10.1016/j.mayocp.2018.11.014"
}