Text and Data Mining valid from 2019-09-17
Received: 29 July 2019
Accepted: 4 September 2019
First Online: 17 September 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics committee of the Faculty of Medicine, Aristotle University of Thessaloniki, Greece. All participants provided written informed consent prior to participating in the study.
: Not applicable.
: The authors declare that they have no competing interests.