TY  - RPRT
TI  - When can a risk factor be used as a worthwhile screening test?
AU  - N J Wald
AU  - A K Hackshaw
AU  - C D Frost
PY  - 1999
DO  - 10.1136/bmj.319.7224.1562
UR  - https://pubmed.ncbi.nlm.nih.gov/10591726/
ID  - 10591726
ER  -