Chen, Mei-yuan
Li, Zi-ping
Sun, Zhao-na
Ma, Ming
Article History
Received: 3 January 2020
Accepted: 5 February 2020
First Online: 17 February 2020
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 Linyi people’s Hospital and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study.