Funding for this research was provided by:
National Natural Science Foundation of China (81874027, 31970862)
Guangzhou MunicipalScience and Technology project (201803010001)
Article History
Received: 10 March 2020
Revised: 25 April 2020
Accepted: 11 May 2020
First Online: 13 June 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: Ethical approval not applicable as this is a systematic review and meta-analysis.
: This is a systematic review and meta-analysis so for this type of study informed consent is not applicable.