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Article History

Received: 3 October 2017

Accepted: 22 March 2018

First Online: 5 April 2018

Ethics approval and consent to participate

: The research was reviewed and approved by the Ethics Committee of West China Hospital. All procedures in the study involving human participants were performed in accordance with the ethical standards of West China Hospital and/or the national research committee, as well as the 1964 Helsinki Declaration and its later amendments or comparable ethical standards. Before collecting human samples, all participants signed informed consent forms according to our institutional guidelines.

: Not applicable.

: The authors declare that they have no competing interests.No benefits in any form have been received or will be received from a commercial party related directly or indirectly to the subject of this article.

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