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Caperchione CM, Kolt GS, Savage TN, et al. WALK 2.0: Examining the effectiveness of Web 2.0 features to increase physical activity in a ‘real world’ setting: an ecological trial. BMJ Open 2014;4:e006374. This article has been corrected since it was first published. The word ‘protocol’ has been included at the end of the title.