Table 1.

Methodological quality assessment document (the number of yes answers was counted for each study to give a total score out of 10)

Number	Criteria	Yes	No	Unclear
1	Inclusion/exclusion criteria clearly described
2	Study population clearly described
3	Study population representative of those in clinical practice
4	Control group clearly described
5	Sampling method clearly described
6	Live study subjects
7	Live control subjects
8	Quantitative method or semiquantitative method using minimum of two independent observers
9	Reliability and/or validity of methods described
10	Study limitations addressed