**2.2 Data analysis**

Data analysis was performed by examining the frequency of mention of a research term either as keywords in titles, abstracts, or in the whole document. The analysis was done in VOSviewer software supplemented by analysis using Zotero and MS Excel. Results were summarized as a VOSviewer item map, tables, and graphs showing the frequency of mention of a research term or administrative region of Tanzania (**Figure 1**).
