Table 2. General characteristics of studies and patients enrolled from studies retrieved for meta-analysis.

Study	Year	Origin	Design	Sample size	Mean age	M/F	TP	FP	FN	TN
Benci et al. (10)	1996	Italy	Prospective	80	38.5	50/30	33	4	0	43
Lichtenstein et al. (14)	2008	France	Prospective	260	68	140/120	74	10	9	167
Parlamento et al. (15)	2009	Italy	Prospective	49	60.9	31/18	31	7	1	10
Cortellaro et al. (16)	2012	Italy	Prospective	120	69	77/43	80	2	1	37
Reissig et al. (17)	2012	Germany	Prospective	362	63.8	228/134	211	6	18	127
Testa et al. (18)	2012	Italy	Prospective	67	55	N	32	5	2	28
Unluer et al. (19)	2013	China	Prospective	72	66.3	35/37	27	7	1	37
Bourcier et al. (20)	2014	France	Prospective	144	77.6	72/72	116	9	7	12
Berlet et al. (21)	2015	Switzerland	Prospective	57	61.3	34/23	12	19	0	26
Liu et al. (22)	2015	China	Prospective	179	71.5	N	106	1	6	66
Corradi et al. (23)	2015	Italy	Prospective	32	62	17/15	15.5	0.5	6.5	9.5
Pagano et al. (24)	2015	Italy	Prospective	105	59	59/46	67	13	1	24
Nazerian et al. (25)	2015	Italy	Prospective	285	71.4	133/152	72	15	9	189
Mongodi et al. (26)	2015	France	Prospective	99	66	78/21	28	7	35	29

M, male; F, female; TP, true positive; FP, false positive; FN, false negative; TN, true negative; N, not mentioned.