Funding for this research was provided by:
Key Research and Development Project of Department of Science & Technology in Sichuan Province (2017SZ0005)
1.3.5 project for disciplines of excellence (ZYGD18012)
Text and Data Mining valid from 2019-07-24
Received: 27 June 2018
Accepted: 23 April 2019
First Online: 24 July 2019
Ethics approval and consent to participate
: Approval for the study was granted by the Clinical Test and Biomedical Ethics Committee of West China Hospital Sichuan University (No. 2013–191). And based on the third term in the ethic approval issued on Oct 14 of 2013 the need to obtain informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.