TY  - RPRT
TI  - Confidence interval construction for effect measures arising from cluster randomization trials.
AU  - A Donner
AU  - N Klar
PY  - 1993
DO  - 10.1016/0895-4356(93)90050-b
UR  - https://pubmed.ncbi.nlm.nih.gov/8437028/
ID  - 8437028
ER  -