Text and Data Mining valid from 2018-04-17
Received: 11 December 2017
Accepted: 29 March 2018
First Online: 17 April 2018
Compliance with ethical standards
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Ethics Committee of the University of Crete and with 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.
: The authors declare that they have no conflict of interest.