Fig. 1. References found by a MEDLINE search with the keywords "peptic ulcer" and "psychological stress," in proportion to all MEDLINE references for each period and in proportion to all MEDLINE references with the keyword "peptic ulcer."
Fig. 3. A model postulating behavioral and psychophysiologic mechanisms that may link psychosocial stress with peptic ulcer. NSAIDs = nonsteroidal antiinflammatory drugs.