Funding for this research was provided by:
National Natural Science Foundation of China (81370219 and 81400267, Beijing, China)
National High-tech Research and Development Program of China (2012AA02A510, Beijing, China)
Text and Data Mining valid from 2019-02-18
Received: 12 February 2018
Accepted: 30 January 2019
First Online: 18 February 2019
Ethics approval and consent to participate
: The study protocol was approved by the institutional review boards of West China Hospital, Sichuan University, an institutional ethics committee. All subjects provided written informed consent before enrolment.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.