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Kvarstein, Elfrida Hartveit, Espen Arnevik, Vidar Halsteinli, Frida Gullestad Rø, Sigmund Karterud, and Theresa Wilberg. "Health Service Costs and Clinical Gains of Psychotherapy for Personality Disorders: A Randomized Controlled Trial of Day-hospital-based Step-down Treatment Versus Outpatient Treatment At a Specialist Practice." BMC Psychiatry 2013.

Kvarstein, Elfrida Hartveit, et al. "Health Service Costs and Clinical Gains of Psychotherapy for Personality Disorders: A Randomized Controlled Trial of Day-hospital-based Step-down Treatment Versus Outpatient Treatment At a Specialist Practice." BMC Psychiatry 2013.