Funding for this research was provided by:
National Natural Science Foundation of China (81371832)
the Key Project of the Chinese Ministry of Science and Technology (2012ZX10002007, 2013ZX10002001)
Qingdao People's Livelihood Science and Technology Project (15-9-2-91-NSH)
Fundamental Research Funds of Shandong University-Clinical Research Project of Qilu Hospital (2014QLKY11)
the Key Project of Zibo city (2018kj010098, 2019gy010045)
Received: 9 June 2019
Accepted: 12 September 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: Informed consent was obtained from all patients before research. This study was approved by the Medical Ethics Committee of Shandong University.
: Not applicable.
: The authors declare that they have no competing interests.