Table 1 Characteristics of four studies included in this meta-analysis.
Author | Year | Region | Ethnicity | Sample size | |
|---|---|---|---|---|---|
Case | Control | ||||
Liu ZH | 2015 | China | Asian | 460 | 473 |
Wang JY | 2015 | China | Asian | 537 | 517 |
Emamalizadeh B | 2014 | Iran | Asian | 520 | 520 |
Lin CH | 2013 | Taiwan | Asian | 500 | 500 |
