TY  - RPRT
TI  - Methodological bias in cluster randomised trials.
AU  - Seokyung Hahn
AU  - Suezann Puffer
AU  - David J Torgerson
AU  - Judith Watson
PY  - 2005
DO  - 10.1186/1471-2288-5-10
UR  - https://pubmed.ncbi.nlm.nih.gov/15743523/
ID  - 15743523
ER  -