Funding for this research was provided by:
Natural Science Foundation of Shandong Province (ZR2015HM059)
Initial Scientific Research Found of Qilu Hospital of Shandong University (Qingdao) (QDKY2015LH02; QDKY2015QN08)
Article History
Received: 11 March 2018
Accepted: 2 June 2018
First Online: 14 June 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.