Backyard benefits? A cross-sectional study of yard size and greenness and children's physical activity and outdoor play by Jessica Oakley, Rachel L. Peters, Melissa Wake, Anneke C. Grobler, Jessica A. Kerr, Kate Lycett, Raisa Cassim, Melissa Russell, Cong Sun, Mimi L. K. Tang, Jennifer J. Koplin, Suzanne Mavoa

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