Text and Data Mining valid from 2018-11-23
First Online: 23 November 2018
Compliance with Ethical Standards
: No sources of funding were received for the preparation of this article.
: Brandon E. Cohen, Igor Krivitskiy, Sarah Bui, Kevin Forrester, Jeffrey Kahn, Richard Barbers, and Binh Ngo have no conflicts of interest that are directly relevant to the contents of this article.
: The Institutional Review Board of the University of Southern California approved this study.
: Informed consent was not obtained because of the retrospective nature of this study and the determination of lack of potential harm to subjects.