Table 2 Types of included studies

Qualitative studies

36

Qualitative research (case studies)

10

Grey literature (case studies)

9

Multimethod qualitative research

5

Qualitative research (interviews)

5

Grey literature (interviews)

2

Grey literature (multimethod qualitative)

2

Qualitative research (ethnography)

1

Qualitative research (multimethod)

1

Grey literature (qualitative)

1

Mixed methods

15

Mixed methods research

8

Grey literature (mixed methods)

7

Quantitative studies

8

Survey analysis

5

Interrupted time series analysis

1

Longitudinal study

1

Controlled before and after study

1

Literature reviews

5

Systematic review

2

Literature review

2

Grey literature (literature review)

1

Other studies

28

Descriptive piece

5

Multimethod (literature review and qualitative data)

4

Evaluation

4

Doctoral thesis

3

Grey literature (think tank piece)

2

Feasibility study (development of a tool to help commissioners)

2

Grey literature (opinion piece)

2

Framework development

1

Descriptive news article

1

Briefing paper

1

Grey literature (policy paper)

1

Grey literature (strategy piece)

1

Opinion piece

1

Total

92