Jin, Fuqiang http://orcid.org/0000-0001-7740-9582
Xing, Jie
Article History
Received: 8 April 2018
Accepted: 11 July 2018
First Online: 20 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: This study was approved by the Ethics Committee of Cangzhou Central Hospital, and all participants or direct family members signed the written informed consents.