title: [Aggressive factors, defensive factors and regulatory factors in peptic ulcer].
mesh_terms: D005246:Feedback; D005744:Gastric Acid / Q000378:metabolism; D005753:Gastric Mucosa / Q000378:metabolism; D006801:Humans; D010437:Peptic Ulcer / Q000209:etiology* / Q000378:metabolism; D004856:Postural Balance