Reference	Time	Number of cases (Comprehensive group)		Number of cases (Single group)
Reference	Time	Effective	Total	Effective	Total
Xinfeng Lin. et al. [10]	2001	66	68	28	32
Changlin Lei. et al. [11]	2007	31	34	21	34
Fengli Tian. et al. [12]	2011	30	31	22	31
Wenwei Xu. et al. [13]	2016	60	63	50	63
Pengcheng Liu. et al. [14]	2013	72	75	47	71
Jing Zhang. et al. [15]	2016	37	40	32	40
Jing Jiang. et al. [16]	2009	68	70	44	50
Meng Cao. et al. [17]	2010	32	34	25	31
Jidong Huang. et al. [18]	2007	35	36	25	30
Moutong Liu. et al. [19]	2015	83	85	72	85
Zerong Long. et al. [20]	2003	34	36	25	30
Juan Fang. et al. [21]	2009	38	40	32	40
Wenqiang Huang. et al. [22]	2001	41	42	34	40
Shujin Qiu. et al. [23]	2008	47	60	12	30
Qiongna Xing. et al. [24]	2013	51	54	49	54
Wenying Dai. et al. [25]	2014	29	30	26	30
Shujing He. et al. [26]	2011	40	45	32	45
Hongliu Chen. et al. [27]	2014	41	45	35	45
Peng Zhang. et al. [28]	2010	34	40	27	40
Quan Hu. et al. [29]	2011	35	36	32	36
Ke Wang. et al. [30]	2010	44	46	35	40
Shicong Wang. et al. [31]	2016	48	50	36	48
Yunfei Tu. et al. [32]	2010	33	33	30	33
Juan Chen. et al. [33]	2012	75	83	53	81
Jincheng Zhang. et al. [34]	2009	48	50	40	48
Xainqiang Qi. et al. [35]	2009	30	32	24	32
Jianghua Qu. et al. [36]	2008	80	84	61	84