TY  - RPRT
TI  - Epidemiologic methods in clinical trials.
AU  - K J Rothman
PY  - 1977
DO  - 10.1002/1097-0142(197704)39:4+<1771::aid-cncr2820390803>3.0.co;2-2
UR  - https://pubmed.ncbi.nlm.nih.gov/322841/
ID  - 322841
ER  -