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Pratt, Michael; Sarmiento, Olga L; Montes, Felipe; Ogilvie, David; Marcus, Bess H; Perez, Lilian G; Brownson, Ross C; Kahlmeier, Sonja (2012). The implications of megatrends in information and communication technology and transportation for changes in global physical activity. Lancet, 380(9838):282-293.