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