1. The Sahlgrenska Academy , University of Gothenburg , Institute of Health and Care Sciences , Box 457, 405 30 Gothenborg , Gothenburg , Sweden
2. Department of Medicine , Hallands Hospital Varberg , Träslövsvägen 68, 432 37 , Varberg , Sweden
3. Primary Health Care Unit, Department of Public Health and Community Medicine , Institute of Medicine, The Sahlgrenska Academy , University of Gothenburg , Box 457, 405 30 , Gothenborg , Sweden
4. Spenshult Research and Development Centre , Bäckagårdsvägen 47, 302 74 , Halmstad , Sweden
5. Angered Local Hospital , Halmtorget 1, 424 65 , Gothenburg , Sweden
6. Department of Research, Development and Education , Hallands Hospital , Varberg , Träslövsvägen 68, 432 37 Varberg , Sweden
7. Department of Anesthesia and Intensive Care , Hallands Hospital , Varberg , Träslövsvägen 68, 432 37 Varberg , Sweden
8. Department of Surgery , Hallands Hospital , Halmstad , Lasarettsvägen, 302 33 Halmstad , Sweden