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Pratt M, Sarmiento OL, Montes F, Ogilvie D, Marcus BH, Perez LG, Brownson RC; Lancet Physical Activity Series Working Group.Pratt M, et al.Lancet. 2012 Jul 21;380(9838):282-93. doi: 10.1016/S0140-6736(12)60736-3.Lancet. 2012.PMID: 22818940Free PMC article.Review.