Patients are recruited by interested general practitioners in the city of Sarpsborg and surroundings and remitted to two study-physicians who make the initial evaluation of inclusion- and exclusion criteria, as well as treatment, follow-up and outcome assessments during the whole study-period. The patients are treated by one of the two study-physicians in the 6-weeks treatment-period. From the 6. week, the patient sees the other physician, who is unaware of the allocated intervention, for further registration and assessment.