Davies, A. L., Spiga, F., Caldwell, D. M., Savović, J., Palmer, J. C., Tomlinson, E., Moore, T. H. M., Summerbell, C. D., & Higgins, J. P. T. (in press). Factors associated with effectiveness of interventions to prevent obesity in children: a synthesis of evidence from 204 randomized trials. BMJ Public Health,