Figure 2.
The world map displays the distribution of 48 studies by country. A legend titled Number of articles shows a scale from 1 to 6. Countries shaded more darkly have higher counts. China appears with the highest value. South Korea, Germany, Italy, and several European countries show relatively high numbers. Other countries, including the United States, Australia, and parts of South America and Asia, show lower counts. The note states that the analysis of 48 studies identifies China, South Korea, Germany, Europe, and Italy as countries with the highest number of research articles. Sources Created by the authors with Microsoft Excel.Number of studies by country