| Methods | Proportion | Article number |
| survey | 33.33% | 9 |
| network analysis and the Granger causality test | 7.41% | 2 |
| machine learning | 11.11% | 3 |
| interviews and content analysis | 7.41% | 2 |
| content analysis and survey | 18.52% | 5 |
| content analysis | 25.93% | 7 |