Median number of patients enrolled in each study type
| Type of study | Median number of patients (IQR)* |
| All studies (excluding systematic review and narrative review) | 46 (66) |
| Case series | 41 (68) |
| Narrative reviews | 36 178 (36 136.5) |
| Cohort studies | 57 (n/a)† |
| Systematic reviews | 25 760 (24 706) |
*Studies that did not state patient numbers were not included in calculations.
†Only one cohort study was found.
n/a, not applicable.