Cluster randomized trials to study the comparative effectiveness of therapeutics: stakeholders' concerns and recommendations.
Mazor KM, Sabin JE, Goff SL, Smith DH, Rolnick S, Roblin D, Raebel MA, Herrinton LJ, Gurwitz JH, Boudreau D, Meterko V, Dodd KS, Platt R. Cluster randomized trials to study the comparative effectiveness of therapeutics: stakeholders' concerns and recommendations. Pharmacoepidemiol Drug Saf. 2009 Jul; 18(7):554-61.