About the Authors

César A. Hidalgo

cesar_hidalgo@ksg.harvard.edu

Affiliation Center for International Development and Harvard Kennedy School, Harvard University, Cambridge, Massachusetts, United States of America

Nicholas Blumm

Affiliations Center for Network Science, Department of Physics, Biology and Computer Science, Northeastern University, Boston, Massachusetts, United States of America, College of Computer and Information Science, Northeastern University, Boston, Massachusetts, United States of America

Albert-László Barabási

Affiliations Center for Network Science, Department of Physics, Biology and Computer Science, Northeastern University, Boston, Massachusetts, United States of America, Center for Complex Network Research and Department of Physics, University of Notre Dame, Notre Dame, Indiana, United States of America, Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

Nicholas A. Christakis

Affiliation Department of Health Care Policy and Department of Medicine, Harvard Medical School, Boston, Massachusetts, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: CAH ALB NAC. Performed the experiments: CAH. Analyzed the data: CAH. Contributed reagents/materials/analysis tools: CAH NAC. Wrote the paper: CAH NB ALB NAC. Worked on database and website: NB.