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Physical activity surveillance in parks using direct observation.
Ward P, McKenzie TL, Cohen D, Evenson KR, Golinelli D, Hillier A, Lapham SC, Williamson S. Ward P, et al. Among authors: lapham sc. Prev Chronic Dis. 2014 Jan 2;11:130147. doi: 10.5888/pcd11.130147. Prev Chronic Dis. 2014. PMID: 24384304 Free PMC article.
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