1. Rigshospitalet, The University Hospitals Centre for Health Research (UCSF), Copenhagen, Denmark;
2. Section for Health Services Research, Department of Public Health, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark;
3. Faculty of Health and Medical Sciences, University of Copenhagen, Denmark;
4. Section for Surgical Pathophysiology, Rigshospitalet and Glostrup Hospital, Copenhagen, Denmark