TY  - RPRT
TI  - Upper gastrointestinal endoscopy without prior sedation.
AU  - S Sahm
AU  - H Dancygier
DO  - 10.1016/s0016-5107(89)72924-2
UR  - https://pubmed.ncbi.nlm.nih.gov/2599303/
ID  - 2599303
ER  -