Funding for this research was provided by:
Qinghai Provincial Agricultural Science and Technology Achievements Transformation and Extension Project (2013-N-531)
Received: 26 November 2018
Accepted: 7 April 2019
First Online: 30 April 2019
Ethics approval and consent to participate
: Written informed consent was obtained from each patient prior to enrollment, and the present study was approved by the ethics committee of Qinghai Province People’s Hospital.
: Not applicable.
: All authors have read and approved the final manuscript and declare that they have no competing interests.