The International Prevalence Study on Physical Activity: results from 20 countries

Adrian Bauman, Fiona Bull, Tien Chey, Cora L Craig, Barbara E Ainsworth, James F Sallis, Heather R Bowles, Maria Hagstromer, Michael Sjostrom, Michael Pratt, The IPS Group
International Journal of Behavioral Nutrition and Physical Activity 2009, 6:21 (31 March 2009)

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