Table 1.
Number of included articles by year of publication (N=53).
| Year | Studies, n (%) |
| 2011 | 3 (6) |
| 2012 | 1 (2) |
| 2013 | 1 (2) |
| 2014 | 1 (2) |
| 2015 | 3 (6) |
| 2016 | 5 (9) |
| 2017 | 4 (8) |
| 2018 | 5 (9) |
| 2019 | 16 (30) |
| 2020 | 13 (25) |
| 2021 | 1 (2) |
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