title: H2-receptor antagonist non-responders.
mesh_terms: D004381:Duodenal Ulcer / Q000188:drug therapy*; D005744:Gastric Acid / Q000378:metabolism; D006635:Histamine H2 Antagonists / Q000627:therapeutic use*; D006801:Humans; D012008:Recurrence; D013997:Time Factors
chemical_list: D006635:Histamine H2 Antagonists