title: Analyzing use of diagnostic signs.
mesh_terms: D003937:Diagnosis, Differential; D003951:Diagnostic Errors; D006801:Humans; D010437:Peptic Ulcer / Q000000981:diagnostic imaging*; D011336:Probability; D011859:Radiography; D013223:Statistics as Topic; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging*