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Additional Information

Competing Interests

Todd Vision is an Academic Editor on the PeerJ Board. Heather Piwowar is a cofounder of ImpactStory, a nonprofit startup that provides altmetrics data to PeerJ.

Author Contributions

Todd J Vision conceived and designed the experiments, analyzed the data, wrote the paper.

Heather A Piwowar conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper.

Grant Disclosures

The following grant information was disclosed by the authors:

NSF OCI-0830944, DBI-0743720

NSERC Discovery Grant to M. Whitlock (UBC)

Data Deposition

The following information was supplied regarding the deposition of related data:



This study was funded by DataONE (OCI-0830944), Dryad (DBI-0743720), and a Discovery grant to Michael Whitlock from the Natural Sciences and Engineering Research Council of Canada. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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