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Article History

Received: 27 December 2017

Accepted: 12 September 2018

First Online: 1 October 2018

Ethics approval and consent to participate

: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional Review Board of Ethics Committee of Hangzhou Red Cross Hospital and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The ethics review board of Hangzhou Red Cross Hospital approved this study. The requirement for informed consent to participate was waived because the review of the patients’ data was anonymous.

: Not applicable.

: The authors declare that they have no competing interests.

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