1. Sorlandet Hospital Kristiansand; Department of Medicine; Servicebox 416 Kristiansand Norway 4604
2. University of Oslo; Institute of Health and Society, Dep. of Health Management and Health Economics; PO Box 1089 Blindern Oslo Norway 0318
3. Norwegian Knowledge Centre for the Health Services; Global Health Unit; Oslo Norway
4. Telemark Hospital; R&D; Ulefossvatn Skien Norway 3710