TY  - RPRT
TI  - Introduction to endoscopy.
AU  - B D Jones
AU  - M E Gross
PY  - 1990
DO  - 10.1016/s0195-5616(90)50300-9
UR  - https://pubmed.ncbi.nlm.nih.gov/2238366/
ID  - 2238366
ER  -