1. Center for Clinical Research Västmanland Hospital Uppsala University Västerås Sweden
2. Epistat Uppsala Sweden
3. Department of Anesthesia & Intensive Care University Hospital Örebro Sweden
4. Department of Surgical and Perioperative Sciences, Anesthesiology and Intensive Care Medicine (Sundsvall) Umeå University Sundsvall Sweden
5. Department of Anesthesiology and Intensive Care Lund University Lund Sweden
6. Skane University Hospital Lund Sweden
7. Department of Surgical Sciences Uppsala University Uppsala Sweden
8. Kalmar Hospital Kalmar Sweden
9. Södra Älvsborg Hospital Borås Sweden