TY  - RPRT
TI  - Subject selection in hospital-based case-control studies.
AU  - J A Knottnerus
PY  - 1987
DO  - 10.1016/0021-9681(87)90071-3
UR  - https://pubmed.ncbi.nlm.nih.gov/3818872/
ID  - 3818872
ER  -