Text and Data Mining valid from 2019-04-10
Received: 15 September 2018
Revised: 13 March 2019
Accepted: 21 March 2019
First Online: 10 April 2019
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.
: All of the procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: The need to obtain informed consent was waived as this research comprised a retrospective review of the medical records.