TY  - RPRT
TI  - Gastrointestinal endoscopy.
AU  - W Ruse
PY  - 1992
DO  - 10.5694/j.1326-5377.1992.tb137216.x
UR  - https://pubmed.ncbi.nlm.nih.gov/1435484/
ID  - 1435484
ER  -