## 3 Methodology
### Characteristics of Selected Primary Studies  
Based on the filters and inclusion exclusion criteria applied, we started with 219 papers from the Scopus database. After filtering based on the scope of the literature review and other factors, we were left with 46 papers. We will briefly discuss the papers that were included in this study to explain how we could classify and derive insights from the literature and the topics they discuss. As an initial step, we classified the studies according to the type of publication. Our findings are presented in Figure 2.  
The figure contains the distribution of studies per year (dotted line), with their number (maximum 8) indicated on the right side. For each type, the number of studies is written in the circle of the corresponding color. As shown in Figure 2, the distribution of publication types from 2017 to 2024 reveals several key trends in the selected primary studies. Journal articles dominated the landscape, with consistently high numbers across all years. Their frequency increased from 6 in 2019 to a peak of 8 in 2022, followed by a slight decline to 7 in 2024, reflecting the sustained importance of journals as the primary venue for scholarly dissemination. Conference papers demonstrated moderate fluctuation. Starting with 1 in 2018, they peaked at 5 in 2023, suggesting their continued relevance in fast-evolving fields, although with fewer contributions than journal articles. Book publications remained minimal, with only one exception in 2020. Book chapters, similarly sparse, appeared solely in 2024 with just one publication, highlighting their more peripheral role in this research domain. The dotted line tracking the total number of publications each year reveals a general upward trend in research activity peaking in 2023 before slightly dipping in 2024. This trajectory reflects a growing academic interest and output in the area under study, with journal articles consistently serving as the dominant dissemination medium. Figure 1: Search and selection procedure. Meanwhile, conference reviews, reviews, and short surveys remained relatively low in frequency, with modest increases over time. Notably, erratum and retracted papers emerged only in 2023, albeit in minimal numbers, which may indicate increased scrutiny or corrections in the field. The editorial category appeared for the first time in 2024, suggesting an evolving role of editorials in academic discourse. These trends highlight the shifting landscape of knowledge dissemination, with articles and conference papers maintaining dominance and books and reviews providing supplementary insights. The recent emergence of retractions and errata may also reflect evolving academic integrity standards and quality control measures in research publications. The methodological rigor of the reviewed papers improved significantly over the years. In 2018, only 3 papers met the strong methodological criteria, but this number increased to 27 in 2023, highlighting a growing focus on robust research designs. However, the slight decline in 2024 (16 papers) suggests variability in methodological adherence. Clarity, which measures how well studies communicate their findings, saw a notable rise, peaking with 31 papers in 2022. This suggests that 2022 was a pivotal year for clearly articulated research. However, the decline in 2023 (25 papers) and 2024 (19 papers) may indicate the increasing complexity in the research topics, requiring more precise communication strategies. The Completeness of the studies, assessing whether all necessary details such as the methodology, results, and limitations are reported, followed a similar pattern. It peaked in 2022 (24 papers) but then declined in 2023 (17 papers) and further to 9 in 2024. This suggests potential concerns regarding the thoroughness of reporting in recent studies. Transparency, a key factor for reproducibility, remained relatively stable, with moderate increases from 2018 (5 papers) to 2022 (17 papers).