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Article History

Received: 8 August 2018

Accepted: 19 March 2019

First Online: 23 April 2019

Ethics approval and consent to participate

: This study was approved by Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital. Informed consents were obtained from all patients.

: Not applicable.

: The authors declare that they have no competing interest.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.