Text and Data Mining valid from 2018-12-01
Received: 26 September 2018
Accepted: 22 November 2018
First Online: 1 December 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of West China Hospital (No: 201302007). All participants will be required to provide written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.
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