ABSTRACT
Preferred Reporting Items For Systematic Reviews And Meta-Analyses (PRISMA) criteria were applied for this review (PLoS_Medicine, 2009). The initial approach comprised an integrated meta-analysis search on the SDI database (Serviço de Documentação e Informação FEUP) for each type of item/resource on the 34 associated scientific magazines and on 28 databases namely Informaworld (Taylor and Francis), Scopus, Web of Science, Springer, IEEE Xplore, PubMed, Science Direct. The reports selection process had two distinct phases.
