Funding for this research was provided by:
the Science and Technology Project of Guangzhou (201400000002)
the Science and Technology Project of Guangzhou (2014Y2-00065)
Received: 26 August 2016
Accepted: 18 June 2018
First Online: 28 June 2018
Ethics approval and consent to participate
: This review evaluated data from published studies and was exempt from ethics committee approval. This review did not involve any direct research on patients, and no informed consent was required.
: Not applicable.
: The authors declare that they have no competing interests.
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