Measuring physical activity-related environmental factors: reliability and predictive validity of the European environmental questionnaire ALPHA von Spittaels, Heleen, Verloigne, Maïté, Gidlow, Christopher, Gloanec, Julien, Titze, Sylvia, Foster, Charlie, Oppert, Jean-Michel, Rutter, Harry, Oja, Pekka, Sjöström, Michael, De Bourdeaudhuij, Ilse

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