About the Authors

Sungmin Lee

Affiliation IceLab, Department of Physics, Umeå University, Umeå, Sweden

Luis E. C. Rocha

Affiliation IceLab, Department of Physics, Umeå University, Umeå, Sweden

Fredrik Liljeros

Affiliation Department of Sociology, Stockholm University, Stockholm, Sweden

Petter Holme

petter.holme@physics.umu.se

Affiliations IceLab, Department of Physics, Umeå University, Umeå, Sweden, Department of Sociology, Stockholm University, Stockholm, Sweden, Department of Energy Science, Sungkyunkwan University, Suwon, Korea

Competing Interests

Petter Holme is an academic editor of PLoS ONE. This does not alter the authors' adherence to all the PLoS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: PH. Performed the experiments: SL LECR. Analyzed the data: SL LECR. Wrote the paper: PH FL.