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| Study | First author's name | Year of publication | Study design | Ethnicity of study population | Sample size(case/control) |
|---|---|---|---|---|---|
| S1 | Cordell(GWAS) | 2013 | Case-control | European Caucasian | 340/5159 |
| S2 | Cordell(Replication) | 2013 | Case-control | European Caucasian | 417/2520 |
| S3 | Zhao(GWAS) | 2014 | Case-control | Chinese Han | 329/1240 |
| S4 | Zhao(Replication) | 2014 | Case-control | Chinese Han | 356/1962 |
