| Variables | Categories | N |
|---|---|---|
| Publication year | 1995 | 3 |
| 1998 | 2 | |
| 2001 | 1 | |
| 2002 | 1 | |
| 2005 | 1 | |
| 2006 | 2 | |
| 2009 | 1 | |
| 2010 | 1 | |
| 2011 | 1 | |
| 2017 | 1 | |
| 2018 | 2 | |
| 2019 | 1 | |
| 2024 | 1 | |
| Country | Korea | 1 |
| China | 16 | |
| Norway | 1 | |
| Study Type | Case report | 2 |
| Case series | 1 | |
| Before-After Study | 11 | |
| Non-RCT | 4 | |
| Non-RCT : Non-Randomized Controlled Trial | ||