Table 1.

Quality check items.

Aim of the work
1	Description of a specific, clearly stated purpose
2	The research question is scientifically relevant
Inclusion criteria (selection bias)
3	Description of inclusion and/or exclusion criteria
Data collection & processing (performance bias)
4	Data collection is clearly described and reliable
5	Data processing is clearly described and reliable
6	Algorithms are clearly described and referenced
Data loss (attrition bias)
7	Drop-outs < 20%
Outcomes (detection bias)
8	Outcomes are topic relevant
9	The work answers the scientific question stated in the aim
Presentation of the results
10	Presentation of the results is sufficient to assess the adequacy of the analysis
11	The main findings are clearly described
Statistical approach
12	Appropriate statistical analysis techniques
13	Clearly states the statistical test used
14	Actual probability values reported for the main outcomes