TY  - RPRT
TI  - Case-control studies: a sequential approach.
AU  - R T O'Neill
AU  - C Anello
PY  - 1978
DO  - 10.1093/oxfordjournals.aje.a112639
UR  - https://pubmed.ncbi.nlm.nih.gov/727211/
ID  - 727211
ER  -