(b)
| Study | Year | City, Country | Region | Race | RRF |
|
| |||||
| Lim et al. [33] | 2008 | Singapore | Asia | Indian | 9.6 |
| Mixed | 3.0 | ||||
| Malay | 2.8 | ||||
| Chinese | 1.0 | ||||
+using Chinese as a baseline frequency of 1.0.
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