TY  - RPRT
TI  - Colonoscopy or flexible proctosigmoidoscopy.
AU  - B M Stephenson
AU  - P J Finan
PY  - 1990
DO  - 10.1007/bf02150755
UR  - https://pubmed.ncbi.nlm.nih.gov/2248647/
ID  - 2248647
ER  -