Text and Data Mining valid from 2019-03-15
Received: 17 November 2018
Accepted: 28 February 2019
First Online: 15 March 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study protocol was previously approved from the Catholic University bioethics committee and all procedures performed in studies involving human participants were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: All participants provided written informed consent.