About the Authors

Richard Haber

† Deceased.

Affiliation Department of Medicine, University of California, San Francisco, United States of America

Warren Browner

To whom correspondence should be addressed. E-mail: warren@cpmcri.org

Affiliation California Pacific Medical Center, San Francisco, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WB RH. Performed the experiments: RH. Analyzed the data: WB. Wrote the paper: WB RH.