Funding for this research was provided by:
Hospital Research Foundation of Gansu Provincial people's Hospital (16gssy3-1)
Gansu Provincial Health Industry Plan (gswsky2017-56)
Article History
Received: 2 February 2020
Accepted: 16 May 2020
First Online: 28 May 2020
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.