About the Authors

Gunther Eysenbach

Affiliation Centre for Global eHealth Innovation, University Health Network; and Department of Health Policy, Management and Evaluation, University of Toronto, Toronto, Ontario, Canada

Competing Interests

The author has no relations to PNAS or its publisher, but is publisher and editor of an OA journal (Journal of Medical Internet Research, http://www.jmir.org), which is funded by author contributions.

Author Contributions

GE conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, and wrote the paper.