TY  - RPRT
TI  - Development and analysis of observational data bases.
AU  - T H Lee
AU  - L Goldman
PY  - 1989
DO  - 10.1016/0735-1097(89)90161-7
UR  - https://pubmed.ncbi.nlm.nih.gov/2768729/
ID  - 2768729
ER  -