TY  - RPRT
TI  - Observer variability in upper gastrointestinal endoscopy.
AU  - D Cantor
AU  - R Midgley
AU  - T Imperato
AU  - S Yassinger
PY  - 1982
UR  - https://pubmed.ncbi.nlm.nih.gov/7158247/
ID  - 7158247
ER  -