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The sydney playground project: popping the bubblewrap - unleashing the power of play: a cluster randomized controlled trial of a primary school playground-based intervention aiming to increase children's physical activity and social skills

Anita C Bundy*, Geraldine Naughton, Paul Tranter, Shirley Wyver, Louise Baur, Wendy Schiller, Adrian Bauman, Lina Engelen, Jo Ragen, Tim Luckett, Anita Niehues, Gabrielle Stewart, Glenda Jessup and Jennie Brentnall

BMC Public Health 2011, 11:680  doi:10.1186/1471-2458-11-680