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Article History

Received: 4 July 2018

Accepted: 4 September 2018

First Online: 3 October 2018

Ethics approval and consent to participate

: This retrospective study was approved by the Institutional Review Board (IRB) of Peking University People’s Hospital. All patients involved in the study consent to participate in the study. And the written consent (patient identifiable information and data) has been obtained from all the patients.

: All individual person’s data consent to publish.

: The authors declare that they have no competing interests.

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