. 2017 Jun;29(2):212–217. doi: 10.4314/mmj.v29i2.25
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© 2017 The College of Medicine and the Medical Association of Malawi. This work is licensed under the Creative Commons Attribution 4.0 International License. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Figure 1.
Flow chart showing the selection of articles from PubMed