TY  - RPRT
TI  - Valid selection of subjects in case-control studies.
AU  - J J Schlesselman
PY  - 1985
DO  - 10.1016/0021-9681(85)90040-2
UR  - https://pubmed.ncbi.nlm.nih.gov/4008596/
ID  - 4008596
ER  -