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Newcastle–Ottawa scale for quality assessment of included studies
| Study | Year | Selection | Comparability | Outcome |
|---|---|---|---|---|
| Shen et al1 | 2004 | **** | ** | ** |
| Goto et al2 | 2006 | *** | ** | * |
| Rafiei et al3 | 2012 | *** | ** | *** |
| Shen et al4 | 2002 | *** | * | ** |
| Yu et al5 | 2017 | *** | * | ** |
| Arjmand et al6 | 2014 | *** | * | ** |
| Chen et al7 | 2010 | *** | ** | ** |
| Tecder et al8 | 2010 | *** | ** | ** |
| Krishnaveni et al9 | 2015 | *** | ** | ** |
Note: The number of “*” means the consistency of each study according to the Newcastle-Ottawa Scale.
