Table 1. Main characteristics of included studies in the meta-analysis.

Author	Year	Country	Duration Months	Patients Number	Detection Methods
Arima C[18]	2014	Japan	91	126	cDNA Microarray
Cui ZS[19]	2014	China	5	30	Elisa
He DP[20]	2014	China	24	48	RT-PCR, IHC
He JJ[21]	2012	China	40	65	IHC
Hou J[22]	2010	Netherlands	NR*	82	cDNA Microarray
Karlsson A[23]	2014	Sweden	NR*	121	cDNA Microarray
Kastner S	2012	Austria	NR*	16	cDNA Microarray
Lo FY[24]	2012	Taiwan, China	NR*	21	cDNA Microarray
Naumnik W[25]	2009	Poland	NR*	40	Elisa
Rousseaux S[26]	2013	France	NR*	272	cDNA Microarray
Shang GH[27]	2009	China	42	145	Elisa
Shen X[28]	2009	China	24	63	RT-PCR, WB
Su WM[29]	2012	China	24	69	IHC
Wang FL[30]	2009	China	7	53	IHC
Wang JY[31]	2014	China	3	30	Elisa, IHC
Wang Y[32]	2014	China	12	30	RT-PCR, Elisa
Xu SB[33]	2009	China	48	52	IHC
Yang XM[34]	2013	China	24	64	RT-PCR
Zhang SD[35]	2011	China	24	95	IHC
Zhang X[36]	2013	China	36	106	IHC

^*NR: not reporting.