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TABLE OF CONTENTS

Executive summary ................................................................................................3

1. Background.........................................................................................................6

2. Aims....................................................................................................................9

3. Methods............................................................................................................10

3.1 Identifying relevant studies .............................................................................10

3.2 Describing relevant studies.............................................................................13

4. Results..............................................................................................................14

4.1 Identification of studies ...................................................................................14

4.2 Characteristics of studies................................................................................14

4.3 Types of evidence...........................................................................................18

5. Discussion ........................................................................................................24

6. References .......................................................................................................26

Appendix A: Search strategies .............................................................................32

Appendix B: Details of studies included in the review (not screening tools).........46

Appendix C: Details of screening tools included in the review .............................68