Figure 2
The horizontal bar graph compares the frequency of selected studies across different years. The x-axis represents the frequency, ranging from 0 to 10, while the y-axis lists the years from 2018 to 2025. The bars are colored blue and represent the total number of studies for each year. The data points are as follows: 2018 has a frequency of 2, 2020 has a frequency of 3, 2021 has a frequency of 7, 2022 has a frequency of 4, 2023 has a frequency of 1, 2024 has a frequency of 10, and 2025 has a frequency of 3. All values are approximated.Temporal distribution of selected studies by year