Flow of information through the different search phases of a systematic review based on PRISMA 2009 guidelines. Four search engines (i.e. MEDLINE, Scopus, IEEExplore and Compendex) were used to identify the relevant literature. After the screening based on title and abstract and removal of duplicates, 18 articles were selected. After the selection based on the full text article, 8 final articles were included in the current review.