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Article History

Received: 22 February 2016

Revised: 3 June 2016

Accepted: 7 June 2016

First Online: 20 June 2016

Compliance with Ethical Standards

:

: This work was supported by the Intramural Research Program at the National Institutes of Health, under IRB exemption.

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

: The authors declare that they have no conflict of interest.

: The requirement for individual patient consent was waived because clinical care was not affected and all protected health information (PHI) was de-identified.

: The views expressed in this article are those of the authors only and do not represent the official position of the National Institutes of Health.

: This work was completed while all authors were employed by the National Library of Medicine. Current affiliations are the following:MLM—Division of Pharmacoepidemiology, Brigham and Women’s Hospital, Boston, MAFC—Amgen Inc., South San Francisco, CASA—Regenstreif, IndianaCM—National Library of Medicine, National Institutes of Health, Bethesda, MD