Text and Data Mining valid from 2019-02-13
Received: 18 October 2017
Accepted: 18 February 2018
First Online: 13 February 2019
Compliance with ethical standards
: All the authors have declared no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee at which the studies were conducted (IRB approval number 1026), and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.