Sandra Eldridge professor of biostatistics, Deborah Ashby professor of medical statistics, Catherine Bennett statistician, Melanie Wakelin lecturer in medical statistics, Gene Feder professor of primary care research and development
Eldridge S, Ashby D, Bennett C, Wakelin M, Feder G.
Internal and external validity of cluster randomised trials: systematic review of recent trials
BMJ 2008; 336 :876
doi:10.1136/bmj.39517.495764.25