Text and Data Mining valid from 2019-09-09
Received: 19 April 2018
Accepted: 27 August 2019
First Online: 9 September 2019
Compliance with Ethical Standards
: The authors declare that he has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research guidelines.
: Informed consent was obtained from all individual participants included in the study.