Increasing return-to-work among people on sick leave due to common mental disorders: design of a cluster-randomized controlled trial of a problem-solving intervention versus care-as-usual conducted in the Swedish primary health care system (PROSA)

• Elisabeth Björk BrämbergKarolinska Institutet
• Kristina EM HolmgrenRegion Västra Götaland
• Ute BültmannUniversity Medical Center Groningen
• Hanna GyllenstenKarolinska Institutet
• Jan HagbergKarolinska Institutet
• Lars SandmanLinköping University
• Gunnar BergströmKarolinska Institutet