Funding for this research was provided by:
National Natural Science Foundation of China (81572952)
Received: 20 August 2019
Accepted: 25 October 2019
First Online: 12 November 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of SAHZU, and was carried out in accordance with the Declaration of Helsinki. Written informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interests.