| Outcome reported | Study design | Population studied | Preference |
| Adverse effects | RCTs | Short term international travellers | 1 |
| Other populations | 2 | ||
| Cohort studies | Short term international travellers | 3 | |
| Other populations | 4 | ||
| Adverse events | RCTs | Short term international travellers | 5 |
| Other populations | 6 | ||
| Cohort studies | Short term international travellers | 7 | |
| Other populations | 8 |
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