| Zhao et al. | 2006 | 29 | 116 |
| Liang et al. | 2006 | 133 | 122 |
| Ma et al. | 2006 | 88 | 75 |
| Xie et al. | 2006 | 78 | 100 |
| Wang et al. | 2006 | 201 | 360 |
| Xu.et al. | 2007 | 52 | 60 |
| Chu et al. | 2007 | 329 | 220 |
| Wang et al. | 2007 |
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| Ding et al. | 2008 | 52 | 110 |
| Ma et al. | 2011 | 88 | 75 |