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Number of included publications by year and study design.
| Publication year | #Pubs | Prospective cohort | Retrospective cohort | Case- control | Cross- sectional |
|---|---|---|---|---|---|
| 1998 | 1 | 1 | |||
| 2007 | 1 | 1 | |||
| 2008 | 1 | 1 | |||
| 2009 | 5 | 3 | 2 | ||
| 2010 | 6 | 3 | 3 | ||
| 2011 | 9 | 2 | 6 | 1 | |
| 2012 | 13 | 5 | 8 | ||
| 2013 | 12 | 7 | 3 | 1 | 1 |
| 2014 | 19 | 10 | 7 | 2 | |
| 2015 | 19 | 16 | 2 | 1 | |
| 2016 | 12 | 9 | 3 | ||
| 2017 | 8 | 5 | 2 | 1 | |
| Total | 106 | 62 | 37 | 4 | 3 |
