| Research topics | Data type | Method | Number of literatures |
| Factors | questionnaire data | Empirical analysis | 43 |
| Secondary data | Empirical analysis | 11 | |
| questionnaire data & Secondary data | Empirical analysis | 3 | |
| Case | Empirical analysis | 1 | |
| Impacts | questionnaire data | Empirical analysis | 9 |
| Secondary data | Empirical analysis | 10 | |
| questionnaire data & Secondary data | Empirical analysis | 3 | |
| Total |
| 80 |