Inclusive study | abnormal group (case) | normal group (case) | ① | ② | ③ | ④ | ⑤ | ⑥ | ⑦ | ⑧ | Grade |
Feng Qingchun [6] 2017 | 210 | 225 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Zhang Xiaowei [7] 2014 | 93 | 66 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Wang Yan et al. [8] 2013 | 220 | 94 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Wang Jin et al. [9] 2017 | 90 | 451 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Zhou Xiaosheng [10] 2014 | 118 | 316 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Tu Qiuyun [11] 2011 | 288 | 401 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Liu Jing [12] 2015 | 1504 | 1496 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
Tian Qianqian [13] 2014 | 211 | 308 | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |