Funding for this research was provided by:
the project of Science and Technology Department of Shaanxi Province (No. 2016SF-323)
Received: 7 May 2018
Accepted: 18 July 2019
First Online: 26 July 2019
Ethics approval and consent to participate
: The study was performed in accordance with the declaration of Helsinki and approved by the ethics committee of the Second Affiliated Hospital of Xi’an Jiao Tong University. Informed consent was obtained from all patients.
: Not applicable.
: The authors declare that they have no competing interest.