Text and Data Mining valid from 2019-03-15
Received: 1 February 2019
Accepted: 8 March 2019
First Online: 15 March 2019
Compliance with ethical standards
: E. Pelechas declares no conflict of interest; Evripidis Kaltsonoudis declares no conflict of interest; Paraskevi V. Voulgari declares no conflict of interest; Alexandros A. Drosos declares no conflict of interest.
: 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.