TY  - RPRT
TI  - The "case-control" study: valid selection of subjects.
AU  - O S Miettinen
PY  - 1985
DO  - 10.1016/0021-9681(85)90039-6
UR  - https://pubmed.ncbi.nlm.nih.gov/4008595/
ID  - 4008595
ER  -