## 5 Results: Quantitative Analysis and Most Important Publications
### Collaboration Analysis
This suggests that some new affiliations have joined the network but maintain a limited number of collaborations. The average values of avgD and avgWD progressively increase, reaching their highest levels in the most recent period (7.58 and 7.74, respectively). The collaboration networks among countries (NCN) are, as expected, smaller compared to those among affiliations (ACN) but exhibit higher densities. The maximum and average weighted degree values (maxWD and avgWD) are notably high in the most recent period (180.00 and 16.27, respectively). In the recent period, the number of nodes \(|V|\) and edges \(|E|\) increases significantly, indicating an expansion of the network of collaborations among nations. The density of the \(NCN_{newR}\) network (0.1329) is the highest across all periods, highlighting a more connected and centralized collaboration network. Overall, the tables demonstrate that collaborations, both at the level of affiliations and nations, show significant growth in the most recent period, with larger networks and increasing values for both average degree and weighted degree. Table 9 lists the affiliations and countries with maximum degree in ACN and NCN networks built on _Review_. It is worth noting that, among the affiliations, entities from Singapore and Hong Kong are present, while for countries, the United States in the most recent period is supplanted by the United Kingdom. All the affiliations are involved in health. \begin{table}
\begin{tabular}{l l} \hline \hline
**Network** & \(maxD\) \\ \hline \(ACN_{all}\) & Harvard Medical School Boston MA United States \\ \(ACN_{a\!arly\!lyR}\) & Department of Pediatric Yamato City Hospital Japan \\ \(ACN_{medium}\) & Department of Psychiatry and Psychotherapy University Medical Center Mainz \\ \(ACN_{new}\) & Harvard Medical School Boston MA United States \\ \hline \(NCN_{all}\) & United States \\ \(NCN_{a\!arly\!lyR}\) & United States \\ \(NCN_{medium}\) & United States \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Affiliation with maxD in ACN and NCN built on _All_. \begin{table}
\begin{tabular}{l c c c c c c c c} \hline \hline
**Network** & \(|V|\) & \(|E|\) & \(maxD\) & \(\overline{D}\) & \(maxWD\) & \(\overline{WD}\) & \(\overline{\left(D/WD\right)}\) & \(\rho\) \\ \hline \(ACN_{allR}\) & 1870 & 6635 & 57 & 7.10 & 60.00 & 7.25 & 0.93 & 0.0038 \\ \(ACN_{a\!arly\!R}\) & 193 & 276 & 10 & 2.86 & 10.00 & 2.86 & 0.81 & 0.0149 \\ \(ACN_{mediumR}\) & 172 & 635 & 27 & 7.38 & 27.00 & 7.45 & 0.91 & 0.0432 \\ \(ACN_{newR}\) & 1514 & 5737 & 57 & 7.58 & 60.00 & 7.74 & 0.95 & 0.0050 \\ \hline \(NCN_{allR}\) & 86 & 445 & 59 & 10.35 & 203.00 & 17.33 & 0.71 & 0.1218 \\ \(NCN_{a\!arly\!R}\) & 32 & 50 & 12 & 3.12 & 12.00 & 3.19 & 0.68 & 0.1008 \\ \(NCN_{mediumR}\) & 33 & 31 & 7 & 1.88 & 13.00 & 2.61 & 0.48 & 0.0587 \\ \(NCN_{newR}\) & 80 & 420 & 58 & 10.50 & 180.00 & 16.27 & 0.76 & 0.1329 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Affiliation collaboration network (ACN) and nationalities collaboration network (NCN) characteristics extracted from review papers. To better understand the collaboration networks, graphical representations were created specifically for NCNs. Representations for ACNs were not included, as their extensive size and high number of nodes make them less descriptive. Instead, NCN subgraphs were drawn focusing on the 15 countries with the highest degree, highlighting key features of the collaborations. In Figure 8, the network constructed from all reviews, restricted to the 15 countries with the highest degree, is displayed. As can be seen, this network highlights certain countries with higher collaboration intensity (the links in the figure are weighted proportionally to their strength). Shown also in the figure are the 20 strongest links. In particular, collaborations between the United States and Canada, China, Germany, Italy, and the United Kingdom are especially strong, with the United States serving as the central hub of these collaborations. The structure of this figure is the same as that found in the subsequent figures.