Table I.

QUADAS list.

Item no.	Description
1	Representative patient spectrum
2	Clear description of selection criteria
3	Acceptable reference standard
4	Acceptable delay between tests
5	Avoiding partial verification bias
6	Sufficient differential verification bias
7	Avoiding incorporation bias
8	Sufficient description of index test
9	Sufficient description of reference test
10	Blinded interpretation of index test results
11	Blinded interpretation of index reference results
12	Availability of clinical data to the researchers
13	Reporting of uninterpretable indeterminate results
14	Explanation of withdrawals from study

QUADAS, quality assessment of diagnostic accuracy studies.