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Types of investigation sites in Shenzhen in 2014 and 2019.
| Sites | 2014, n | 2019, n |
| Recreational business area or shopping center | 22 | 16 |
| Residential area | 5 | 11 |
| Park | 10 | 7 |
| Transportation hub | 1 | 1 |
| University | 3 | 2 |
| Hospital | 3 | 3 |
| Industrial area | 4 | 5 |
| Total | 48 | 45 |
