Table 2

Study	Prospective (P) or Retrospective (R)	Diagnostically uncertain patients	Gold standard evaluator blinded to results of the physical examination?	Physical examination evaluator blinded to gold standard?	Physical examination evaluator blinded to other imaging?	Verification bias present?
Beaule [4]	P	Yes	Uncertain	Yes	Yes	Yes
Bird [12]	P	Yes	Yes	Yes	Yes	No
Chan [5]	P	Yes	No	Yes	Yes	Yes
Martin [7]	P	Yes	No	Yes	Uncertain	Yes
Mitchell [13]	R	Yes	No	Yes	Uncertain	Uncertain
Narvani [16]	P	Yes	Uncertain	Yes	Uncertain	No
Suenaga [17]	P	No	Uncertain	Yes	Uncertain	Uncertain
Sutlive [5]	P	Yes	Yes	Yes	Yes	No
Hananouchi [8]	P	Yes	Uncertain	Yes	Uncertain	No
Kapron [9]	P	Yes	Yes	Yes	Yes	No
Troelsen [6]	R	No	Yes	Yes	Yes	No
Youdas [10]	P	No	Uncertain	Uncertain	Uncertain	No
Woodley [11]	P	Yes	Yes	Yes	Yes	No
Wang [14]	R	No	Uncertain	Uncertain	Uncertain	Yes

Table 2: Summary of Study Quality Assessment