TY  - RPRT
TI  - Cluster randomized controlled trials in primary care: an introduction.
AU  - Andrew W Murphy
AU  - Adrian Esterman
AU  - Louis S Pilotto
PY  - 2006
DO  - 10.1080/13814780600780627
UR  - https://pubmed.ncbi.nlm.nih.gov/16945880/
ID  - 16945880
ER  -