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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Joan Starr conceived and designed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Eleni Castro analyzed the data, reviewed drafts of the paper.

Mercè Crosas analyzed the data, reviewed drafts of the paper.

Michel Dumontier analyzed the data, reviewed drafts of the paper.

Robert R. Downs analyzed the data, reviewed drafts of the paper.

Ruth Duerr analyzed the data, reviewed drafts of the paper.

Laurel Haak analyzed the data, reviewed drafts of the paper.

Melissa Haendel analyzed the data, reviewed drafts of the paper.

Ivan Herman analyzed the data, reviewed drafts of the paper.

Simon Hodson analyzed the data, reviewed drafts of the paper.

Joe Hourclé analyzed the data, reviewed drafts of the paper.

John Ernest Kratz analyzed the data, reviewed drafts of the paper.

Jennifer Lin analyzed the data, reviewed drafts of the paper.

Lars Holm Nielsen analyzed the data, reviewed drafts of the paper.

Amy Nurnberger analyzed the data, reviewed drafts of the paper.

Stefan Pröll analyzed the data, reviewed drafts of the paper.

Andreas Rauber analyzed the data, reviewed drafts of the paper.

Simone Sacchi analyzed the data, reviewed drafts of the paper.

Arthur P. Smith analyzed the data, reviewed drafts of the paper.

Michael Taylor analyzed the data, reviewed drafts of the paper.

Tim Clark conceived and designed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Funding

This work was funded in part by generous grants from the US National Institutes of Health and National Aeronautics and Space Administration, the Alfred P. Sloan Foundation, and the European Union (FP7). * Support from the National Institutes of Health (NIH) was provided via the grant # NIH 1U54AI117925-01 in the Big Data to Knowledge program, supporting the Center for Expanded Data Annotation and Retrieval (CEDAR). * Support from the National Aeronautics and Space Administration (NASA) was provided under Contract NNG13HQ04C for the Continued Operation of the Socioeconomic Data and Applications Center (SEDAC). * Support from The Alfred P. Sloan Foundation was provided under two grants: a. Grant # 2012-3-23 to the Harvard Institute for Quantitative Social Sciences, “Helping Journals to Upgrade Data Publication for Reusable Research”; and b. a grant to the California Digital Library, "CLIR/DLF Postdoctoral Fellowship in Data Curation for the Sciences and Social Sciences". * The European Union partially supported this work under the FP7 contracts #269977 supporting the Alliance for Permanent Access and #269940 supporting Digital Preservation for Timeless Business Processes and Services. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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