Table 1.
General characteristics of studies (n = 14).
| Variables | Categories | N (%) |
|---|---|---|
| Publication year | 1990–1999 | 1 (7.1) |
| 2000–2009 | 4 (28.6) | |
| 2010–2019 | 9 (64.3) | |
| Research | Observational study | 7 (50.0) |
| Methodology | Case report | 4 (28.6) |
| Case series | 2 (14.3) | |
| Case-cohort study | 1 (7.1) | |
| Experimental study | 4 (28.6) | |
| Randomized controlled study | 2 (14.3) | |
| Before-and-after study | 2 (14.3) | |
| Literature study | 3 (21.4) | |
| Narrative review | 2 (14.3) | |
| Systematic review | 1 (7.1) | |
| Location | China | 8 (57.1) |
| Korea | 4 (28.6) | |
| United Kingdom | 1 (7.1) | |
| Iran | 1 (7.1) |