Usual care
Usual care was defined as routine GP care for patients with MUPS, which could be provided by the GP, physical therapist, mental health nurse and psychologist, without restrictions. The physical therapists and mental health nurses of the health care centers in the control group were blinded to the intervention, i.e. they were not aware of the content of the PARASOL intervention. After the end of the study, participants in the control group were offered to follow the PARASOL intervention.