Text and Data Mining valid from 2019-02-13
Received: 30 December 2018
Accepted: 14 January 2019
First Online: 13 February 2019
Compliance with Ethical Standards
: All authors declare that they have no conflict of interest as it relates to this research project.
: All procedures performed in this retrospective data analysis involving human participants were in accordance with the ethical standards of the institutional review board (IRB #5968), which did not require informed consent.