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| Overall(222) | |
| Province | |
| Fujian | 12(5.4) |
| Guangxi | 144(64.9) |
| Hebei | 9(4.1) |
| Jiangsu | 1(0.5) |
| Liaoning | 56(25.2) |
| Range of sampling date | 2002–2010 |
