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Article History

Received: 17 January 2018

Accepted: 20 November 2018

First Online: 5 December 2018

Ethics approval and consent to participate

: The research protocol was approved by the second Hospital affiliated Zhejiang University Institutional Review Board prior to the start of recruitment and data collection. The written informed consent was obtained from the participant’s next of kin who was on behalf of their family.

: Not applicable.

: The authors declare that they have no competing interests.

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