[Analysis of causes of error in roentgenodiagnosis of gastric cancer and ulcer].
D006801:Humans; D010437:Peptic Ulcer / Q000000981:diagnostic imaging*; D011859:Radiography; D013274:Stomach Neoplasms / Q000000981:diagnostic imaging*; D014456:Ulcer
PEPTIC ULCER/radiography; STOMACH NEOPLASMS/radiography