title: [Apnea-hypopnea. Single or two entities?].
authors: H
authors: H
authors: Schäfer
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D000860:Hypoxia / Q000175:diagnosis / Q000209:etiology*; D017286:Polysomnography; D012891:Sleep Apnea Syndromes / Q000175:diagnosis / Q000209:etiology*