Funding for this research was provided by:
Haikou Key Science and Technology Project (2013-61, 2015-32)
Article History
Received: 27 June 2019
Accepted: 11 August 2020
First Online: 24 August 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 ethics committee of Haikou People’s Hospital (Approval no. 2017-082) 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.