Funding for this research was provided by:
National Natural Science Foundation of China (81473055, 30972539)
Text and Data Mining valid from 2019-12-01
Received: 5 June 2019
Accepted: 5 December 2019
First Online: 12 December 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Harbin Medical University. All participants were provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.