TY  - RPRT
TI  - Survival analysis in observational studies.
AU  - K Bull
AU  - D J Spiegelhalter
PY  - 1997
DO  - 10.1002/(sici)1097-0258(19970515)16:9<1041::aid-sim506>3.0.co;2-f
UR  - https://pubmed.ncbi.nlm.nih.gov/9160498/
ID  - 9160498
ER  -