ABSTRACT
The literature review was based on PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analysis).
For the preparation of the PRISMA Statement were made researches in different databases. The resources used were exclusively databases (Compendex, Medline, PubMed, Scopus, Inspec, Web of Science) and scientific journals (BioMedCentral, Cambridge, Emerald, Diary of O. Journals, Informaworld, Metapress, Oxford Journals, Science Direct., Science Magazine, While Online Library). Were also consulted others articles using a different research sources (such as bibliographies of selected articles to the PRISMA).
