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| Author | Year | Country | Ethnicity | Sex ratio (M/F) |
Sample size |
||
|---|---|---|---|---|---|---|---|
| Case | Control | Case | Control | ||||
| Yu RL | 2015 | China | Asian | 1.23 | 0.84 | 515 | 518 |
| Liu RR | 2014 | China | Asian | 1.09 | 1.15 | 341 | 423 |
| Li NN | 2013 | China | Asian | 1.35 | 1.13 | 760 | 708 |
M: male, F: female.
