TY  - RPRT
TI  - The case control study: the problem and the prospect.
AU  - M A Ibrahim
AU  - W O Spitzer
PY  - 1979
DO  - 10.1016/0021-9681(79)90026-2
UR  - https://pubmed.ncbi.nlm.nih.gov/312803/
ID  - 312803
ER  -