| Research methods | Number of/papers | Weights% |
| Qualitative methods | 107 | 94.7 |
| General analysis or presentation | 96 | 84.9 |
| Comparative analysis | 5 | 4.4 |
| Literature review | 1 | 0.8 |
| Case study | 5 | 4.4 |
| Quantitative methods | 6 | 5.3 |
| Empirical analysis | 6 | 5.3 |
| Total | 113 | 100.0 |