© The Author(s) 2018
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Review Process: This article is a short opinion piece and has not been submitted to external peer reviewers, but was reviewed for accuracy by the editorial board before publication.
Authorship: All named authors meet the International Committee of Medical Journal Editors (ICMJE) criteria for authorship of this manuscript, take responsibility for the integrity of the work as a whole, and have given final approval to the version to be published.