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Article History

Received: 7 December 2017

Accepted: 23 January 2018

First Online: 5 February 2018

Ethics approval and consent to participate

: This is a retrospective trial. All centers obtained permission form their own ethics committee. Virginia Commonwealth University IRB approval under protocol number HM20006627.

: All authors read the final manuscript and consented and agreed to its publication. Since this is a retrospective trial, consent was not necessary to be obtained from patients to review the identified data.

: The authors’ declare no competing interests with the current work.

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