Text and Data Mining valid from 2019-01-04
Received: 5 October 2018
Accepted: 21 December 2018
First Online: 4 January 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures involving human participants were in accordance with the ethical standards of the institution.
: Informed consent was obtained from all individual participants included in the study.