About the Fibromyalgia Working Group The OMERACT Fibromyalgia Working Group is Jasvinder A SinghCo-Chair Vibeke StrandCo-Chair Peter TugwellCo-Chair Working Group Publications Expand Fibromyalgia Syndrome Fibromyalgia Syndrome Fibromyalgia Syndrome Module at OMERACT 9: Domain Construct Content and Criterion Validity of the Preliminary Core Dataset for Clinical Trials in Fibromyalgia Syndrome Toward Development of a Fibromyalgia Responder Index and Disease Activity Score: OMERACT Module Update