We used two search engines - PubMed and Google Scholar - and eight data bases - ProQuest, EBSCO, SAGE Journals Online, ScienceDirect, Wiley Online Library, Periodicals Archive Online, SciELO and Redalyc - to identify and retrieve relevant studies.
La búsqueda y recuperación de los materiales la hicimos en dos motores de búsqueda: PubMed y Google Scholar, y en ocho bases de datos: ProQuest, EBSCO, SAGE Journals Online, ScienceDirect, Wiley Online Library, Periodicals Archive Online, SciELO y Redalyc.
A busca e recuperação dos materiais foi realizada em dois motores de busca: PubMed e Google Scholar, e em oito bases de dados: ProQuest, EBSCO, SAGE Journals Online, ScienceDirect, Wiley Online Library, Periodicals Archieve Online, SciELO e Redalyc.