Funding for this research was provided by:
National Natural Science Foundation of China (#81172745)
China Scholarship Council (#201506015023)
Received: 30 December 2018
Accepted: 3 July 2019
First Online: 1 August 2019
Ethics approval and consent to participate
: This study was approved by the Peking University Third Hospital Medical Science Research Ethics Committee (Code: IRB00006761–2016022).
: Written patient consent was obtained prior to submitting the manuscript for publication.
: All authors have completed the ICMJE uniform disclosure form at ExternalRef removed and declare: support from the National Natural Science Foundation of China, China Scholarship Council and National Key Research and Development Program of China for the submitted work; no other relationships or activities that could appear to have influenced the submitted work.