This literature review focuses solely upon peer-reviewed literature. Relevant studies have been located using electronic bibliographic databases such as Medline, Embase, Global Health, International Bibliography of the Social Sciences (IBSS), PsychINFO, and Web of Science. The exact search terms depend on individual database but include:
Peer reviewed literature research reports produced by the UN agencies were also included. These were sought from the relevant agency websites. In addition, expert consultation and a review of the reference lists (‘references of references’) of selected articles were used to locate other relevant papers.
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