Table 1. Number of randomized trials by year of publication.
| Year of publication | Randomized studies | |
|---|---|---|
| 2017 | 03 | |
| 2016 | 03 | |
| 2015 | 02 | |
| 2014 | 06 | |
| 2013 | 02 | |
| 2012 | 01 | |
| 2009 | 02 | |
| 2005 | 01 | |
| 2004 | 03 | |
| 1993 | 01 | |
| Total | 24 |
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