Included studies | Publishing time | Document type | Evidence lifting factor | Grade |
Hanmin Xu [16] | 1992 | CR | Zhongjing prescription (+1) single intervention of Zhongjing prescription (+1) | High |
Lina Zhang [17] | 1999 | CR | Dose-response relationship (+1) | Medium |
Yuxia Wang [18] | 1999 | CR | Zhongjing prescription (+1) | Medium |
Defang Hao [19] | 2008 | 'RCT | Limitations of the study (−2) Zhongjing prescription (+1) | Medium |