Acknowledgements
We are very grateful for the financial support of the Amsterdam Public Health research institute, the Coronel Institute of Occupational Health, Safe Work Australia and the Dutch Ministry of Social Affairs and Employment 

and the Finnish Institute of Occupational Health, the Finnish Ministry of Social Affairs and Health (till 2019).

Collaboration within Cochrane and the Campbell Collaboration:

The scope of Cochrane Work overlaps with that of many other Cochrane Entities: Back Review Group, Musculoskeletal Injuries Group, Depression, Anxiety and Neurosis Group, Injuries Group, EPOC Group, Gynaecological Cancer Group, Airways Group, Acute Respiratory Infections Group, Ear Nose and Throat Disorders Group, Pregnancy and Child Birth Group, Heart Group, Skin Group, Multiple Sclerosis Group, Public Health Group, Hepato-Biliary Disorders Group, Peripheral Vascular Disease Group, Alcohol and Drugs Group, HIV Group, Non-Randomised Studies Methods Group, Economic Methods Group. Head this way for contact details of all Review Groups.

We are actively seeking collaboration with all of the above. Collaboration ranges from discussion about methods and possible overlap in proposed new titles to acting as peer referees and editors for other groups' reviews and asking them to do likewise on ours.

The Campbell Collaboration gathers evidence on the effectiveness of interventions in the area of social welfare which is also closely related to the scope of our review group. We are aiming to co-register reviews that are of mutual interest.