Methodological approach | Number of papers |
---|---|
Systematic review | 1 |
Randomised controlled trial | 1 |
Controlled trial – not randomised | 1 |
Other experimental design | 1 |
Observational design (cohort, case-control, time series) | 15 |
Cross-sectional survey, questionnaire | 23 |
Case series, case study, audit | 10 |
Descriptive | 22 |
Qualitative research | 3 |
Expert group opinion | 3 |
Expert opinion (generally single author) | 17 |
Economic study | 3 |
Commentary/Non-systematic review | 10 |
Unknown/Paper unavailable | 3 |