About the Authors

Dana K. Thompson

vbk@duke.edu

Affiliation Division of Rheumatology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America

Kim M. Huffman

Affiliation Physical Medicine and Rehabilitation, Veterans Affairs Medical Center, Durham, North Carolina, United States of America

William E. Kraus

Affiliation Division of Cardiovascular Medicine, Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America

Virginia Byers Kraus

Affiliation Division of Rheumatology, Department of Medicine, Duke University Medical Center, Durham, North Carolina, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: DKT KMH WEK VBK. Performed the experiments: DKT. Analyzed the data: DKT. Contributed reagents/materials/analysis tools: DKT KMH WEK VBK. Wrote the paper: DKT VBK.