**2.1 Study selection**

The articles retrieved from the databases in accordance to the selection criteria were imported into EndNote, an electronic reference manager. Duplicate articles were also deleted and were then examined to be included and excluded in accordance to the stated criterion for PECO. Those that were excluded were justified with


#### **Figure 1.** *Inclusion and exclusion summary of PECO.*

reasons documented. Those articles with only abstract access were also removed due to limited information provided. Those articles that were remaining were also peer reviewed by two other individuals who were MSc students at Queen Mary University to prevent any errors and bias being made during the selection process. This involved a brief peer review examining the chosen article titles, authors and abstracts to identify relevancy to the topic.
