TY  - RPRT
TI  - Cluster randomized controlled trials.
AU  - Suezann Puffer
AU  - David J Torgerson
AU  - Judith Watson
PY  - 2005
DO  - 10.1111/j.1365-2753.2005.00568.x
UR  - https://pubmed.ncbi.nlm.nih.gov/16164589/
ID  - 16164589
ER  -