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Eight most common study methods extracted from the publications mentioning the study design used in the abstract.
| Rank | Study method | Publications, n |
| 1 | Survey | 1515 |
| 2 | Systematic review | 733 |
| 3 | Cohort study | 512 |
| 4 | Meta-analysis | 480 |
| 5 | Randomized control trial | 362 |
| 6 | Case study | 199 |
| 7 | Scoping review | 79 |
| 8 | Case-control study | 62 |
