TY  - RPRT
TI  - Reporting observational studies.
AU  - M B Bracken
PY  - 1989
DO  - 10.1111/j.1471-0528.1989.tb02410.x
UR  - https://pubmed.ncbi.nlm.nih.gov/2751950/
ID  - 2751950
ER  -