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Research area division.
| Research area | Provinces |
|---|---|
| Eastern area | Beijing Tianjin Hebei Shanghai Jiangsu Zhejiang Fujian Shandong Guangdong Hainan |
| Central area | Shanxi Anhui Jiangxi Henan Hubei Hunan |
| Western area |
Inner Mongolia Guangxi Chongqing Sichuan Guizhou Yunnan Tibet Shaanxi Gansu Qinghai Ningxia Xinjiang |
| Northeast area | Liaoning Jilin Heilongjiang |
