Table 2. The QUADAS-2 methodological scores of selected articles.

1–14, Methodologic criteria in Table 2.

Y, Yes; fulfilled QUADAS methodologic criteria (1 point).

N, No; did not fulfill QUADAS methodologic criteria (0 point).

U, Unclear; did not provide sufficient information to evaluate (0.5 point).

QUADAS-2, the Quality Assessment of Diagnostic Accuracy Studies tool-2.