About the Authors

Frederick Wolfe

fwolfe@arthritis-research.org

Affiliation National Data Bank for Rheumatic Diseases and University of Kansas School of Medicine, Wichita, Kansas, United States of America

Brian T. Walitt

Affiliation Washington Hospital Center, Washington, D.C., United States of America

Robert S. Katz

Affiliation Rush University Medical Center, Chicago, Illinois, United States of America

Winfried Häuser

Affiliations Department of Psychosomatic Medicine and Psychotherapy Technische Universität München, Munich, Germany, Department Internal Medicine I, Klinikum Saarbrücken, Saarbrücken, Germany

Competing Interests

Winfried Häuser has received one consulting honorarium by Daiichi-Sankyo and honoraria for educational lectures by Abbott Germany, Eli-Lilly, Janssen-Cilag and Pfizer in the last 5 years. He is the head of the steering committee of the German guideline on FMS. This does not alter the authors’ adherence to all the PLOS ONE policies on sharing data and materials. The other authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FW WH. Performed the experiments: FW. Analyzed the data: FW. Contributed reagents/materials/analysis tools: FW BW WH. Wrote the paper: FW BW RK WH. Developed the ideas behind this study: FW BW RK WH.