Funding for this research was provided by:
Natural Science Foundation of Shandong Province (Code: ZR2014HM042)
Received: 5 September 2017
Accepted: 15 January 2018
First Online: 5 February 2018
Change Date: 25 June 2018
Change Type: Correction
Change Details: The editor has retracted this article  because of flaws and inconsistencies in the methodology, reporting and interpretation of the data.
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Shandong University (reference number 2010037). Written informed consent was obtained from all patients at the time of their treatment for the use of material in future research.
: Not applicable.
: The authors declare that they have no competing interests.
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