Table 2.
Number of studies in which single biomarkers are investigated.
| Number of Studies that Investigated a Specific Biomarker | Frequency | % of All Included Studies |
|---|---|---|
| 1 | 190 | 68.8% |
| 2 | 38 | 13.8% |
| 3 | 12 | 4.3% |
| 4 | 9 | 3.3% |
| 5–10 | 19 | 6.9% |
| >10 | 8 | 2.9% |
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