title: [Gastroscopic stage classification of peptic ulcer according to drug therapy--regular and magnification gastroscopy].
mesh_terms: D005773:Gastroscopy; D006635:Histamine H2 Antagonists / Q000627:therapeutic use; D006801:Humans; D013276:Stomach Ulcer / Q000145:classification / Q000188:drug therapy / Q000473:pathology*
chemical_list: D006635:Histamine H2 Antagonists