About the Authors

Jason G Smith

Affiliation Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America

James M Cunningham

To whom correspondence should be addressed. E-mail: jcunningham@rics.bwh.harvard.edu

Affiliation Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

JS carried out all of the experiments. JS and JC designed the experiments and authored the manuscript.