The study interventions were delivered by physiother-
apists practicing primary health care in 6 different counties,
thus minimizing geographical issues for participants
attending intervention sessions. The behavioral approach
was considered to be basic and performable by experienced
physiotherapists with some previous knowledge of behav-
ioral approaches. Prior to study commencement, the
physiotherapists received 1 day of theoretical and practical
training by the project leaders. The project leaders also