Cross-sectorial collaboration in return to work interventions: perspectives from patients, mental health care professionals and case managers in the social insurance sector.

Purpose: Common mental disorders (CMD) are major causes of sick leave and have huge negative impacts on psychosocial well-being and to overall society. The return to work (RTW) process involves various welfare sectors, but often lack collaboration across these sectors and may cause uneven RTW processes. This study reports from an intervention aimed to increase collaboration between the mental health care system (MHCS) and the social insurance sector (SIS).