RT Journal Article SR Electronic T1 Serum serotonin levels are not useful in diagnosing fibromyalgia JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 1267 OP 1268 DO 10.1136/ard.2006.058842 VO 66 IS 9 A1 Gabriel Jaschko A1 Urs Hepp A1 Magdalena Berkhoff A1 Margrit Schmet A1 Beat A Michel A1 Steffen Gay A1 Haiko Sprott YR 2007 UL http://ard.bmj.com/content/66/9/1267.abstract AB