Text and Data Mining valid from 2019-12-04
Received: 11 June 2019
Accepted: 14 November 2019
First Online: 4 December 2019
Compliance with ethical guidelines
: L. Vardakis, Y. Michailidis, A. Mandroukas, G. Mavrommatis, K. Christoulas, and T. Metaxas declare that they have no competing interests.
: 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.