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Article History

Received: 3 August 2018

Accepted: 17 October 2018

First Online: 14 November 2018

Ethics approval and consent to participate

: This study has been approved by the Institutional Review Board at the West China Hospital, Sichuan University. Each author certifies that all investigations were conducted in accordance with ethical principles. The participant involved in the study gave their informed consent and signed and informed consent form.

: Written consent to publish this information was obtained from study participants. Proof of consent to publish from study participants can be requested at any time.

: The authors declare that they have no competing interests.

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