Table 2 Summary of geographic origin of the included studies
Country | Number of studies | percentage |
|---|---|---|
China | 193 | 58.3% |
United States | 83 | 25.1% |
United Kingdom | 8 | 2.4% |
South Korea | 8 | 2.4% |
Japan | 6 | 1.8% |
Italy | 6 | 1.8% |
Turkey | 5 | 1.5% |
Others | 22 | 6.6% |
Country | Number of studies | percentage |
|---|---|---|
China | 193 | 58.3% |
United States | 83 | 25.1% |
United Kingdom | 8 | 2.4% |
South Korea | 8 | 2.4% |
Japan | 6 | 1.8% |
Italy | 6 | 1.8% |
Turkey | 5 | 1.5% |
Others | 22 | 6.6% |