TY  - RPRT
TI  - Explaining community-level variance in group randomized trials.
AU  - Z Feng
AU  - P Diehr
AU  - Y Yasui
AU  - B Evans
AU  - S Beresford
AU  - T D Koepsell
PY  - 1999
DO  - 10.1002/(sici)1097-0258(19990315)18:5<539::aid-sim50>3.0.co;2-s
UR  - https://pubmed.ncbi.nlm.nih.gov/10209810/
ID  - 10209810
ER  -