Funding for this research was provided by:
National High-tech Research and Development Program of China (2012AA02A510, Beijing, China)
Chinese National Nature Science Foundation (81370219 and 81400267, Beijing, China)
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.
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