TY  - RPRT
TI  - Effects of cluster sampling on epidemiologic analysis in population-based case-control studies.
AU  - B I Graubard
AU  - T R Fears
AU  - M H Gail
PY  - 1989
UR  - https://pubmed.ncbi.nlm.nih.gov/2611317/
ID  - 2611317
ER  -