TY  - RPRT
TI  - Fecal occult blood testing. Problems, pitfalls, and diagnostic concerns.
AU  - D A Johnson
PY  - 1989
DO  - 10.1080/00325481.1989.11700673
UR  - https://pubmed.ncbi.nlm.nih.gov/2648374/
ID  - 2648374
ER  -