Searches were undertaken on the Medline (Ovid), Global Health, CINAHL, Scopus and Science Direct databases. 
Medline
Searches were undertaken on the Medline (Ovid), Global Health, CINAHL, Scopus and Science Direct databases. 
Global Health
Searches were undertaken on the Medline (Ovid), Global Health, CINAHL, Scopus and Science Direct databases. 
CINAHL
Searches were undertaken on the Medline (Ovid), Global Health, CINAHL, Scopus and Science Direct databases. 
Scopus
Searches were undertaken on the Medline (Ovid), Global Health, CINAHL, Scopus and Science Direct databases. 
Science Direct