TY  - RPRT
TI  - How should we evaluate a cohort study? Study design.
AU  - R Klein
AU  - B E Klein
PY  - 1997
DO  - 10.1016/s0161-6420(97)30097-9
UR  - https://pubmed.ncbi.nlm.nih.gov/9331189/
ID  - 9331189
ER  -