Gastroscopic and histologic studies on recurrence and intractability of gastric ulcer.
D000328:Adult; D000368:Aged; D001284:Atrophy; D005500:Follow-Up Studies; D005753:Gastric Mucosa / Q000473:pathology; D005773:Gastroscopy; D006801:Humans; D008875:Middle Aged; D012008:Recurrence; D013276:Stomach Ulcer / Q000473:pathology*; D013997:Time Factors