TY  - GEN
AU  - Jones,R
TI  - The case-control study and retrospective controls
SN  - 0007-1447
PY  - 1980///0423
KW  - Epidemiologic Methods
KW  - Humans
KW  - Research Design
KW  - Retrospective Studies
N1  - Publication Type: Letter
UR  - https://doi.org/10.1136/bmj.2.6203.1507-b
ER  -