Table 3.

Stages of the study selection process.

Stage	Description	Participants
S1	Selection of studies identified through different information sources.	H.A., A.P. and G.A.
S2	Exclusion of studies based on duplicates.	H.A., A.P. and G.A.
S3	Exclusion of studies based on a “title, abstract and keywords” screening, against the eligibility criteria.	All authors
S4	Consensus meeting.	All authors
S5	Exclusion of studies based on a “full-text” screening.	All authors
S6	Consensus meeting.	All authors