About the Authors

Brian Walitt

brian.walitt@nih.gov

Affiliation National Center for Complementary and Integrative Health, National Institutes of Health, Bethesda, Maryland, United States of America

Richard L. Nahin

Affiliation National Center for Complementary and Integrative Health, National Institutes of Health, Bethesda, Maryland, United States of America

Robert S. Katz

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

Martin J. Bergman

Affiliation Drexel University College of Medicine, Philadelphia, PA, United States of America

Frederick Wolfe

Affiliation National Data Bank for Rheumatic Diseases, Wichita, KS, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: BW RLN FW. Analyzed the data: BW RLN FW MJB RSK. Wrote the paper: BW RLN FW MJB RSK. Survey Design: BW RLN FW MJB RSK. Survey Administration: MJB RSK.