Table 1. Characteristics information of the included studies.
| Ref | Country of origin | Sample size | Study quality(points) | Survival rate analysis |
|---|---|---|---|---|
| J. Niklinski, et al [35] | Poland and Italy | 94 | 5/9 | Reported |
| Kosuke Kashiwabara et al[31] | Japan | 120 | 5/9 | Reported |
| Hisashi Suzuki, et al [36] | Japan | 101 | 5/9 | Reported |
| Minkyu Jung, et al [37] | Korea | 123 | 7/9 | Reported |
| Martin J. Edelman, et al [38] | USA | 88 | 5/9 | Reported |
| Seong Yong Park, et al [39] | Korea | 298 | 7/9 | Reported |
Study quality was listed using the results of the Newcastle -Ottawa questionnaire.