TY  - RPRT
TI  - How long does it take to learn endoscopy?
AU  - L S Friedman
PY  - 1995
DO  - 10.1016/s0016-5107(95)70143-5
UR  - https://pubmed.ncbi.nlm.nih.gov/8536913/
ID  - 8536913
ER  -