Data extraction

As presented in Figure 1, the database searches described earlier resulted in 290 unique titles and an additional 26 articles were identified from a review of references and or cited reference searches of our included articles. Titles and abstracts were then reviewed independently by two researchers. From these, 127 articles were identified for full-text review. Of these, five were excluded on the basis of language or being unavailable for full-text review because of access through a paywall service. The full texts of the remaining articles were reviewed by two independent researchers. After full-text review, 76 articles met the inclusion criteria and were included in the qualitative synthesis.

Identification of studies, inclusion, and exclusion assessment.