Text and Data Mining valid from 2018-08-22
Received: 16 March 2018
Accepted: 16 July 2018
First Online: 22 August 2018
Ethics approval and consent to participate
: Approval for the study obtained from the Ethics Committee of Gazi University (09.05.2013/01).
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.