Received: 19 July 2018
Accepted: 4 December 2018
First Online: 5 February 2019
Ethics approval and consent to participate
: Patient samples were collected with written informed consent in accordance to the Declaration of Helsinki and all procedures performed in study involving human participants were approved by the ethics committee of the People’s Hospital of Xintai City (XT-2017-125–2017.10.21).
: Not applicable.
: The author declares that he/she has no competing interests.
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