TY  - RPRT
TI  - Gastrointestinal endoscopy.
AU  - A J Smally
AU  - S K Pool
PY  - 1992
DO  - 10.1056/nejm199204023261413
UR  - https://pubmed.ncbi.nlm.nih.gov/1343808/
ID  - 1343808
ER  -