TY  - RPRT
TI  - Observer variability in upper gastrointestinal fiber endoscopy.
AU  - P A Kling
AU  - K Edin
AU  - L Domellöf
PY  - 1985
DO  - 10.3109/00365528509089681
UR  - https://pubmed.ncbi.nlm.nih.gov/4023612/
ID  - 4023612
ER  -