TY  - RPRT
TI  - Changing patterns in perforated peptic ulcer disease.
AU  - L Gunshefski
AU  - L Flancbaum
AU  - R E Brolin
AU  - A Frankel
PY  - 1990
UR  - https://pubmed.ncbi.nlm.nih.gov/1973032/
ID  - 1973032
ER  -