Funding for this research was provided by:
National Natural Science Foundation of China (71804093)
Shandong Provincial Natural Science Foundation (ZR2015HL102)
Shandong Provincial Medical and Health Science and Technology Development Project (2016WS0478)
Article History
Received: 14 January 2019
Accepted: 22 August 2019
First Online: 31 August 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Shandong provincial Qianfoshan Hospital. Written informed consent was obtained from all subjects.
: Not applicable.
: The authors declare that they have no competing interests.