Funding for this research was provided by:
National Key Scientific Instrument and Equipment Development Project in China (NO.2012YQ18011708)
Received: 18 November 2018
Accepted: 22 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: This study obtained ethical approval from the ethics committee of the General Hospital of the People’s Liberation Army. Individual informed consent was obtained from adults and from the parents or guardians of children under 18 years old when they presented in hospital. In addition, verbal assents were given to minors.
: Not applicable.
: The authors declare that they have no competing interests.