Article History
First Online: 10 July 2017
Compliance with Ethical Standards
:
: The data that support the findings of this study are available from the University of Washington, but are part of a proprietary database available via a license agreement so are not publicly available.
: No sources of funding were used for this review article.
: Josh J. Carlson, Shuxian Chen, and Louis P. Garrison Jr. declare that they have no conflicts of interest.