well as in grey literature addressing the research question. The search was performed using EBSCOhost platform, a keyword search from the following electronic databases was conducted: PubMed/MEDLINE, Google Scholar, Science Direct, World Health Organization (WHO) library, and grey literature. Studies were identified by searching literatures published in English language as it is the commonly used language for communication in most SSA countries. We restricted the search to include studies published from January 2008 to June 2018 because initial searches of the literature showed that most relevant studies were conducted after 2008. Additionally, a 10-year literature search is more likely to yield a comprehensive account of previous and current research in the area. Articles were also searched through the 'Cited by' search as well as citations included in theBOC

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