Text and Data Mining valid from 2019-03-05
Received: 11 November 2018
Accepted: 18 February 2019
First Online: 5 March 2019
Ethics approval and consent to participate
: Ethical approval was given by the medical ethics committee of Guangdong General Hospital with the following reference number: No.GDREC2017203H. All participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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