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Penning A, Okely AD, Trost SG, Salmon J, Cliff DP, Batterham M, Howard S, Parrish AM.Penning A, et al. Among authors: parrish am.BMC Public Health. 2017 Aug 15;17(1):657. doi: 10.1186/s12889-017-4660-6.BMC Public Health. 2017.PMID: 28810853Free PMC article.Clinical Trial.