title: Association between the occurrence of peptic ulcers and tobacco smoking.
mesh_terms: D000367:Age Factors; D005260:Female; D006801:Humans; D008297:Male; D010146:Pain; D010437:Peptic Ulcer / Q000209:etiology*; D011044:Poland; D012737:Sex Factors; D012907:Smoking / Q000150:complications*