About the Authors
Joslin Diabetes Center, Harvard Medical School, Boston, Massachusetts, United States of America
Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States of America
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: CRK EMF. Performed the experiments: RS HAF MJC. Analyzed the data: RS HAF MJC. Contributed reagents/materials/analysis tools: CRK EMF. Wrote the paper: RS HAF.