TY  - RPRT
TI  - Gastrointestinal endoscopy (2)
AU  - J F Morrissey
AU  - M Reichelderfer
PY  - 1991
DO  - 10.1056/nejm199110243251705
UR  - https://pubmed.ncbi.nlm.nih.gov/1922209/
ID  - 1922209
ER  -