Wu, Min-hao
Xiao, Ling-fei
Liu, Huo-wen
Yang, Zhi-qiang
Liang, Xiao-xiao
Chen, Yan
Lei, Jun
Deng, Zhou-ming
Article History
Received: 20 June 2019
Accepted: 12 September 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the principles of the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The present study was retrospective; for this type of study the local ethics committee waived formal consent.
: Not applicable.
: The authors declare that they have no competing interests.