2.
纳入研究的方法学质量
Quality assessment of methodology of included studies
| Included studies | Randomization | Allocation concealment | Blinding | Withdral | ITT analysis |
| Sandler 2000[12] | Adequate | Adequate | Double-blind | Yes | Yes |
| Sederholm 2005[13] | Adquate | Adequate | Double-blind | Yes | Yes |
| Qing SUN 2006[14] | Adequate | Unclear | Unclear | Yes | Unclear |
| ShujunLIU 2003[15] | Unclear | Unclear | Unclear | Yes | Unclear |