Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (7162034)
Beijing Neurosurgical Institute Innovation Exploration Foundation (201721)
Text and Data Mining valid from 2019-10-04
Received: 3 July 2019
Accepted: 28 September 2019
First Online: 4 October 2019
Ethics approval and consent to participate
: The present study was approved by the Ethics Committee of Beijing Tiantan Hospital, Capital Medical University (Beijing, China).
: Not applicable.
: The authors declare that they have no competing interests.