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Characteristics of the included publications (n=71).
| Characteristics | Number of publications (%) |
|---|---|
| Publication year | |
| 2001–2006 | 19 (26.76) |
| 2007–2012 | 12 (16.90) |
| 2013–2017 | 40 (56.34) |
| Searches | |
| PubMed | 26 (36.62) |
| Science Direct | 29 (40.85) |
| Google Scholar | 16 (22.54) |
