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We performed the search in March 2015 and we updated it in August. We found 478 publications and, by the selection criteria chosen, 30 adherent publications to the research were selected, as illustrated in Table 1.

Table 1

Application of selection criteria for papers

Papers previously selected 478 
Duplicated papers −221 
Reading titles −121 
Reading abstracts −84 
Full papers not available −12 
Reading full papers −19 
Snowballing sampling +9 
Total adherent articles 30 
Papers previously selected 478 
Duplicated papers −221 
Reading titles −121 
Reading abstracts −84 
Full papers not available −12 
Reading full papers −19 
Snowballing sampling +9 
Total adherent articles 30 

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