Text and Data Mining valid from 2019-02-06
Received: 19 September 2018
Accepted: 21 January 2019
First Online: 6 February 2019
Compliance with ethical standards
: All co-authors have reviewed the International Committee of Medical Journal Editors Form for Disclosure of Potential Conflicts of Interest and declare that they have nothing to disclose.
: All procedures performed in this study were in accordance with the ethical standards of the institutional research committee (study identification: HREBA.CC-17-0329) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was waived for this study and was implied by specific action (i.e., responding to emails).