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Quality assessment of the studies according to QUADAS-2.
| Risk of bias |
Feasibility |
||||||
|---|---|---|---|---|---|---|---|
| Reference | Patient selection | Index test | Reference standard | Flow and timing | Patient selection | Index test | Reference standard |
| (13) | L | H | H | L | L | U | L |
| (14) | L | H | H | L | L | U | L |
| (15) | L | H | H | L | L | U | L |
| (16) | L | H | H | L | L | U | L |
| (17) | L | H | H | L | L | U | L |
| (18) | L | H | H | L | L | U | L |
| (19) | L | H | H | L | L | U | L |
| (20) | L | H | H | L | L | U | L |
| (21) | L | H | H | L | L | U | L |
The risk of bias was defined as low (L), high (H) or unclear (U).
