TY  - RPRT
TI  - Occult blood tests.
AU  - J D Hardcastle
AU  - W M Thomas
PY  - 1989
DO  - 10.1016/s0140-6736(89)90910-0
UR  - https://pubmed.ncbi.nlm.nih.gov/2570915/
ID  - 2570915
ER  -