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Article History

Received: 4 December 2017

Accepted: 7 November 2018

First Online: 20 November 2018

Ethics approval and consent to participate

: This study was approved by the Institutional Review Boards of Fudan University Shanghai Cancer Center, China. Written informed consent was obtained from the patients before treatment. Due to the retrospective design of the study, the local ethic committee confirmed that informed consent was not necessary from participants.

: Not applicable.

: The authors declare that they have no competing interests.

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