Text and Data Mining valid from 2020-01-13
Received: 17 April 2019
Accepted: 20 December 2019
First Online: 13 January 2020
Ethics approval and consent to participate
: This systematic review protocol was registered with the International Prospective Register of Systematic Reviews (PROSPERO) on 24 July 2018. Any amendments to the protocol will be documented on the PROSPERO site. Ethical approval is not required for this study as it is a systematic review. The results will be submitted to peer-reviewed journals and presented in national and international meetings.
: We would like to thank the Director General of Health Malaysia for his permission to publish this article.
: The authors declare that they have no competing interests.