1 Subjects: “...bibliometric analysis...”

2 Subjects: “...keywords analysis...”

3 Subjects: “...path analysis...”

4 Subjects: “...cost analysis...”

5 Subjects: “...co-integration analysis...”

6 Subjects: “... analysis; Longitudinal study; Qualitative analysis; Statistics; Germany; Switzerland; Denmark; Norway...”

7 Subjects: “...content-based analysis...”

8 Subjects: “...content analysis...”

9 Subjects: “...difference-in-differences analysis...”

10 Subjects: “...side channel analysis...”

11 Subjects: “...cross-country analysis...”