About the Authors

Samuel Arbesman

arbesman@hcp.med.harvard.edu

Affiliations Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts, United States of America, Institute for Quantitative Social Science, Harvard University, Cambridge, Massachusetts, United States of America

Nicholas A. Christakis

Affiliations Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts, United States of America, Institute for Quantitative Social Science, Harvard University, Cambridge, Massachusetts, United States of America, Department of Sociology, Harvard University, Cambridge, Massachusetts, United States of America, Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.