Text and Data Mining valid from 2019-04-10
Received: 12 February 2019
Accepted: 1 April 2019
First Online: 10 April 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, which did not require informed consent.