Workflow of the review process. 14,036 articles were retrieved from 7 major repositories and other resources. Screening based on title and keywords helped to remove 12,180 articles. Duplication check identified another 184 articles to be removed. The remaining 1,715 articles were reviewed and 1,271 were excluded based on the content in the abstract. The remaining 444 text were assessed by both reviewers, with 196 full articles excluded based on mutual consensus and arbitrage of a third party expert. The final list consisted of 248 articles with qualitative synthesis, from which 97 articles were selected for deep analysis.