What evidence do we have on implementation? Or: It might work in a trial, but how do we make it work round here?

Popay, Jennie and Roberts, H. and Arai, L. and Roen, K. (2006) What evidence do we have on implementation? Or: It might work in a trial, but how do we make it work round here? In: Public health evidence : tackling health inequalities. :. Oxford University Press, Oxford, pp. 299-308.