. 2019 Apr 12;15(1):18–24. doi: 10.17925/EE.2019.15.1.18
© The Author(s) 2019
Review Process: Double-blind peer review.
Compliance with Ethics: This article involves a review of the literature and did not involve any studies with human or animal subjects performed by any of the authors.
Authorship: All named authors meet the criteria of the International Committee of Medical Journal Editors for authorship for this manuscript, take responsibility for the integrity of the work as a whole and have given final approval for the version to be published.