Fig. 2From: Potential values of circulating tumor cell for detection of recurrence in patients of thyroid cancer: a diagnostic meta-analysisQuality assessment of included studies by using the QUADAS-2 tool. Integrating system of four parts in QUADAS-2 tool, namely patient selection, index test, reference standard, and flow and timing, divided the 7 studies quality assessment into low, unclear and high level. The above graph depicted whole quality level of included 7 studies. And the below pattern stated evlauation process of every study in detailBack to article page