The contribution of active play to the physical activity of primary school children.

"Conflict of interest statement The authors declare that there are no conflicts of interest."

"This project was funded by a project grant from the British Heart Foundation (ref PG/06/142). Rowan Brockman is supported by a British Heart Foundation Studentship (ref FS/09/035/27805). This report is also research arising from a Career Development Fellowship (to Dr Jago) supported by the National Institute for Health Research. The views expressed in this publication are those of the authors and not necessarily those of the NHS, the National Institute for Health Research or the Department of Health. The authors declare that the funding source (British Heart Foundation) had no input into the study design, data collection, analysis and interpretation of data, in the writing of the report or the decision to submit the paper for publication."