| Included studies | Publishing time | Document type | Evidence lifting factor | Grade |
| Fushan Qin [20] | 2007 | CR | Nothing | Low |
| Tao Zhang [21] | 1993 | CR | Added drug interference (−1) | Very low |
| Huaisheng Li [22] | 1996 | CR | Added drug interference (−1) | Very low |
| Chonglin Mou [23] | 1997 | CR | Added drug interference (−1) | Very low |
| Yan Shi [24] | 2001 | CR | Added drug interference (−1) | Very low |
| Xiaofen Wei [25] | 2002 | CR | Added drug interference (−1) | Very low |
| Weiping Shen [26] | 2003 | CR | Added drug interference (−1) | Very low |
| Yufang He [27] | 2005 | 'RCT | Limitation of the study (−2) | Very low |
|
|
|
| Added drug interference (−1) |
|
| Yijuan Zhang [28] | 2006 | CR | Added drug interference (−1) | Very low |
| Jianchun Yu [29] | 2008 | CR | Added drug interference (−1) | Very low |