Nicholls, A., Morley, D., Thompson, M. A., Huang, C., Abt, G., Rothwell, M., …Ntoumanis, N. (in press). The Effects of the iPlayClean Education Programme on Doping Attitudes and Susceptibility to use Banned Substances among High-Level Adolescent Athletes from the UK: A Cluster-Randomised Control Trial. International Journal of Drug Policy,