Text and Data Mining valid from 2020-01-01
Received: 30 October 2019
Accepted: 7 January 2020
First Online: 14 January 2020
Compliance with ethical standards
: This study was not funded by any source and all authors declare no conflict of interest.
: All procedures performed in the study were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments. Institutional Review Board (IRB) approval for the study was not necessary because all patient data with identifying information is stripped from the NIS repository.