Received: 28 September 2018
Accepted: 24 June 2019
First Online: 28 June 2019
Ethics approval and consent to participate
: We had prior ethics approval from Institutional ethical committee of Jinan Military General Hospital (NO: 2010017) and adult patient consent or child guardian consent (under 16-year old) was obtained for this study. The research was carried out according to the principles set out in the Declaration of Helsinki 1964 and all subsequent revisions.
: The consent for publication of the data was obtained from all adult patients or child guardian (under 16-year old) and the relevant institutional review board had approved the study.
: The authors declare that they have no competing interests.