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Article History

Received: 27 December 2017

Accepted: 26 March 2018

First Online: 4 April 2018

Ethics approval and consent to participate

: All procedures involving human participants were in accordance with the ethical standards of the institutional research committee, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

: All patients gave written informed consent.

: The authors declare that they have no competing interests.

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