TY  - RPRT
TI  - Gastrointestinal endoscopy.
AU  - L Slonim
PY  - 1992
DO  - 10.5694/j.1326-5377.1992.tb137370.x
UR  - https://pubmed.ncbi.nlm.nih.gov/1301040/
ID  - 1301040
ER  -