Funding for this research was provided by:
This study was supported by grants from the National Research Foundation of Korea (NRF) and the Ministry of Science, ICT, and Future Planning, Republic of Korea (2019R1H1A2079935)
Received: 12 October 2020
Accepted: 29 March 2021
First Online: 6 April 2021
: Ethical approval is not required for this meta-analysis, because this result was from a secondary analysis of data available in previous reports.
: Not applicable.
: The authors declare that they have no competing interests.