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Article History

Received: 18 January 2018

Accepted: 23 February 2018

First Online: 2 March 2018

Authors’ information

: Tuncay Kiris takes responsibility for all aspects of the reliability and freedom from bias of the data presented and their discussed interpretation.

: 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.