TY  - RPRT
TI  - A teaching instrument for proctosigmoidoscopy.
AU  - R TURELL
PY  - 1957
DO  - 10.1001/jama.1957.82970360002008a
UR  - https://pubmed.ncbi.nlm.nih.gov/13376340/
ID  - 13376340
ER  -