TY  - RPRT
TI  - Flexible sigmoidoscopy for screening.
AU  - K D Wrenn
PY  - 1988
DO  - 10.7326/0003-4819-108-3-494_2
UR  - https://pubmed.ncbi.nlm.nih.gov/3341695/
ID  - 3341695
ER  -