. 2021 Mar;21(1):277–285. doi: 10.4314/ahs.v21i1.36
© 2021 Kong L et al.
Licensee African Health Sciences. This is an Open Access article distributed under the terms of the Creative commons Attribution License (https://creativecommons.org/licenses/BY/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure. 1.
Flow diagram of study searching and selection process.