| Study | Study design | Sample size (n1/n2) | Nation/region | Age (mean or range) | Baseline | EC approval | Jadad score |
| Dong et al., 2012 [6] | RCT, parallel 2 arms | 120 (60/60) | China | E: 8.61 (5~12) years C: 8.57 (5~13) years | Adequate | Not reported | 1 | Hong et al., 2011 [7] | RCT, parallel 3 arms | 99 (33/33/33) | China | 5~13 years | Adequate | Not reported | 2 | Hui et al., 2006 [8] | RCT, parallel 2 arms | 67 (35/32) | China | E: 5~12 years C: 6~11 years | Adequate | Not reported | 2 | Liu, 2007 [9] | RCT, parallel 2 arms | 60 (30/30) | China | 5~12 years | Not reported | Not reported | 1 | Karaman et al., 2011 [10] | RCT, parallel 2 arms Prospective, randomized, placebo controlled, single-blind study | 83 (57/26) | Turkey | E: 8.5 ± 3.2 years C: 8.9 ± 3.3 years | Adequate | Yes | 3 | Ding et al., 2007 [11] | RCT, parallel 2 arms | 80 (42/38) | China | 3~13 years | Adequate | Not reported | 1 | Tong and Zhan, 2009 [12] | RCT, parallel 2 arms | 60 (30/30) | Guinea-Bissau | 6~20 years | Adequate | Not reported | 2 | Moursy et al., 2014 [13] | RCT, parallel 3 arms | 186 (62/62/62) | Egypt | 15.7 years (range 10–21 years) | Adequate | Yes | 3 | Tian and Zhong, 2008 [14] | RCT, parallel 2 arms | 228 (116/112) | China | E: 7.58 ± 2.16 years C: 8.26 ± 2.67 years | Adequate | Not reported | 3 | Ling and Chen, 2011 [15] | RCT, parallel 2 arms | 60 (30/30) | China | E: 9.2 (5~16) years C: 9.1 (5~15) years | Adequate | Not reported | 2 | Radmayr et al., 2001 [16] | RCT, parallel 2 arms | 40 (20/20) | Austria | E: 8.6 (5~16) years C: 8.0 (5~14) years | Adequate | Yes | 2 | Radvanska et al., 2011 [17] | RCT, parallel 2 arms Prospective, single-blind, randomized, placebo controlled design | 29 (16/13) | Slovakia | E: 8.7 ± 1.4 years C: 8.6 ± 1.3 years | Adequate | Yes | 4 | Yang et al., 2012 [18] | RCT, parallel 2 arms | 69 (35/34) | China | 3~15 years | Adequate | Not reported | 1 | Luo, 2010 [19] | RCT, parallel 2 arms | 40 (20/20) | China | E: 8.5 ± 0.1 years C: 8.4 ± 0.2 years | Adequate | Not reported | 1 | Tang et al., 2012 [20] | RCT, parallel 2 arms | 48 (24/24) | China | E: 5~11 years C: 5~12 years | Adequate | Not reported | 2 | Qiu, 2008 [21] | RCT, parallel 2 arms | 56 (31/25) | China | 3~16 years | Not reported | Not reported | 1 | Zhu et al., 2003 [22] | RCT, parallel 2 arms | 76 (41/35) | China | 4~15 years | Adequate | Not reported | 1 | Zhang, 2010 [23] | RCT, parallel 2 arms | 80 (40/40) | China | 3~18 years | Adequate | Not reported | 1 | Chen and Gu, 2003 [24] | RCT, parallel 2 arms | 72 (40/32) | China | 5~14 years | Adequate | Not reported | 1 | Yuksek et al., 2003 [25] | RCT, parallel 2 arms | 24 (12/12) | Turkey | E: 7.67 ± 2.34 years C: 7.41 ± 2.67 years | Adequate | No | 1 | Hong and Zhang, 2009 [26] | RCT, parallel 2 arms | 30 (15/15) | China | 8~21 years | Adequate | Not reported | 1 |
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