Text and Data Mining valid from 2018-08-14
Received: 28 February 2018
Accepted: 1 August 2018
First Online: 14 August 2018
Compliance with ethical standards
: The authors have no conflicts of interest to disclose.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: No patients were involved. This is a retrospective study of patient’s data, and an IRB approval was obtained.