Serum calcium levels in unrecognized perforated peptic ulcer; report of two cases.
D002118:Calcium / Q000097:blood*; D002136:Calcium, Dietary; D006801:Humans; D010439:Peptic Ulcer Perforation
D002136:Calcium, Dietary; D002118:Calcium
CALCIUM/in blood; PEPTIC ULCER/perforation