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| Study design | Government, institutional, or public | Industry | Mixed | Total |
| Case‐control | 14 | 2 | 2 | 18 |
| Cohort | 33 | 5 | 2 | 40 |
| RCT/CCT | 32 | 15 | 5 | 52 |
| Total | 79 | 22 | 9 | 110 |
CCT: controlled clinical trial RCT: randomised controlled trial
