title: [Unclear conditions--common mechanisms?].
authors.affiliation: Seksjon for arbeids- og trygdemedisin, Universitetet i Oslo, Postboks 1130, Blindern 0318 Oslo, Norway. dag.bruusgaard@medisin.uio.no
authors.forename: Dag
authors.initials: D
authors.lastname: Bruusgaard
authors.forename: Bård
authors.initials: B
authors.lastname: Natvig
mesh_terms: D015673:Fatigue Syndrome, Chronic / Q000145:classification / Q000175:diagnosis / Q000503:physiopathology; D005356:Fibromyalgia / Q000145:classification / Q000175:diagnosis / Q000503:physiopathology; D006801:Humans; D011602:Psychophysiologic Disorders / Q000145:classification / Q000175:diagnosis / Q000503:physiopathology; D013001:Somatoform Disorders / Q000145:classification / Q000175:diagnosis / Q000503:physiopathology; D013577:Syndrome