Text and Data Mining valid from 2018-05-09
First Online: 9 May 2018
Compliance with Ethical Standards
: Ekaterini C. Tampaki, Athanasios Tampakis, Constantinos E. Alifieris, Dimitrios Krikelis, Anastasia Pazaiti, Michalis Kontos, and Dimitrios T. Trafalis declare that they have no conflicts of interest.
: No funding was received for this work.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in this study.