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Article History

Received: 8 December 2018

Accepted: 28 February 2019

First Online: 12 March 2019

Compliance with ethical standards

:

: The authors declare that they have 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.

: Institutional ethics review board approval was obtained, and informed consent was waived for this retrospective study.