Funding for this research was provided by:
National Natural Science Foundation of China (81700740)
Text and Data Mining valid from 2019-12-01
Received: 24 July 2019
Accepted: 20 December 2019
First Online: 27 December 2019
Ethics approval and consent to participate
: This study was approved by the Medical Ethics Committee of West China Hospital of Sichuan University and was conducted in accordance with the principles of the Declaration of Helsinki II. Written informed consents were obtained from all participants.
: All participants provided written informed consent for study data to be published.
: The authors declare that they have no competing interests.