After publication of the article , it has been brought to our attention that an incorrect reference has been used in this article, both in the main body and additional file 2. The reference in question is #105 in the main body and #74 in additional file 2. Here it is cited as “Lindsay H, Brussoni M. Injuries and helmet use related to non-motorized wheeled activities among pediatric patients. Chronic Dis Inj Canada. 2014;34(2–3):74–81”.
The authors would like to indicate it should be “Lindsey, E. Physical activity play and preschool children’s peer acceptance: Distinctions between rough-and-tumble and exercise play. Early Educ Dev. 2014;25(3): 297–294”.