title: [Chronic fatigue syndrome. To be or not to be?].
authors.forename: J M
authors.initials: JM
authors.lastname: Bertolín
authors.forename: J
authors.initials: J
authors.lastname: Calvo
mesh_terms: D015673:Fatigue Syndrome, Chronic / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology; D006801:Humans