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Scandinavian Journal of Medicine & Science in Sports > 30 > 7 > 1265 - 1275
Scandinavian Journal of Medicine & Science in Sports > 30 > 1 > 117 - 125
Canadian Journal of Public Health > 2012 > 103 > 3 > 170-174
Preventive Medicine > 2010 > 51 > 3-4 > 282-286