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Summary of study centers by province
| Province | n | % |
| Guangdong | 19 | 16.2 |
| Beijing | 18 | 15.4 |
| Zhejiang | 15 | 12.8 |
| Shanghai | 14 | 12.0 |
| Jiangsu | 12 | 10.3 |
| Shandong | 7 | 6.0 |
| Liaoning | 5 | 4.3 |
| Sichuan | 5 | 4.3 |
| Hubei | 4 | 3.4 |
| Henan | 3 | 2.6 |
| Hunan | 3 | 2.6 |
| Shanxi | 3 | 2.6 |
| Tianjin | 3 | 2.6 |
| Heilongjiang | 2 | 1.7 |
| Fujian | 2 | 1.7 |
| Hainan | 1 | 0.9 |
| Xinjiang | 1 | 0.9 |
