M. Taljaard,C. Weijer,J. M. Grimshaw and M. P. Eccles. The Ottawa Statement on the ethical design and conduct of cluster randomised trials: precis for researchers and research ethics committees. Bmj. 2013;346:10.1136/bmj.f2838.
M. Taljaard,C. Weijer,J. M. Grimshaw and M. P. Eccles. The Ottawa Statement on the ethical design and conduct of cluster randomised trials: precis for researchers and research ethics committees. Bmj. 2013;346:10.1136/bmj.f2838.