Table 2.
Methods used in included studies.
| Studies (n) | Percent (%) | ||
|---|---|---|---|
| Type of instrument | |||
| Custom questionnaire | 15 | 27.3% | |
| Single validated questionnaire | 9 | 16.3% | |
| Multiple validated questionnaires | 19 | 34.5% | |
| Interviews alone | 12 | 21.8% | |
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