Text and Data Mining valid from 2019-04-11
Received: 12 January 2019
Accepted: 1 April 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: The study was designed retrospectively. Balikesir University Ethics Committee waivered the need for informed consent regarding the retrospective data and approved this study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.