{"ulcer":"gastric","case-control":"control","aspirin":"non-user","frequency":62}
{"ulcer":"gastric","case-control":"control","aspirin":"user","frequency":6}
{"ulcer":"gastric","case-control":"case","aspirin":"non-user","frequency":39}
{"ulcer":"gastric","case-control":"case","aspirin":"user","frequency":25}
{"ulcer":"duodenal","case-control":"control","aspirin":"non-user","frequency":53}
{"ulcer":"duodenal","case-control":"control","aspirin":"user","frequency":8}
{"ulcer":"duodenal","case-control":"case","aspirin":"non-user","frequency":49}
{"ulcer":"duodenal","case-control":"case","aspirin":"user","frequency":8}