Li 2009.

Study characteristics
Patient sampling	Prospective study
Patient characteristics and setting	21 women with vulval cancer; unclear whether women with clinically suspicious nodes were excluded Median age: not reported Setting: a tertiary hospital in China; recruitment from October 2004 to April 2008
Index tests	Blue dye only (11 women) Technetium and blue dye (10 women) Histological methods unclear
Target condition and reference standard(s)	TC: groin lymph node involvement RS: complete IFL
Flow and timing	Insufficient information available
Comparative
Notes	We were unable to obtain the full article but were able to construct 2 x 2 tables from the abstract
Methodological quality
Item	Authors' judgement	Risk of bias	Applicability concerns
DOMAIN 1: Patient Selection
Was a consecutive or random sample of patients enrolled?	Unclear
Was a case‐control design avoided?	Yes
Did the study avoid inappropriate exclusions?	Unclear
		Unclear	Unclear
DOMAIN 2: Index Test Test group
Had the test operator performed 10 or more procedures?	Unclear
		Unclear	Unclear
DOMAIN 3: Reference Standard
Is the reference standards likely to correctly classify the target condition?	Yes
Were the reference standard results interpreted without knowledge of the results of the index tests?	Unclear
		Unclear	Low
DOMAIN 4: Flow and Timing
Was there an appropriate interval between index test and reference standard?	Unclear
Did all patients receive the same reference standard?	Yes
Were all patients included in the analysis?	Unclear
Were other imaging tests performed prior to the index test to rule out groin lymph node metastases?	Unclear
		Unclear