Despite myriad challenges, clinicians see room for progress.
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Edited by David A. Weitz, Harvard University, Cambridge, MA, and approved November 21, 2016 (received for review August 25, 2016)
Author contributions: L.K. and T.C.L. designed research, performed research, analyzed data, and wrote the paper.
The authors declare no conflict of interest.
This article is a PNAS Direct Submission.
This article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1613732114/-/DCSupplemental.
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