1. Social Medicine, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
2. Health Services Research, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
3. Epidemiology, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
4. Medical Department, Herlev and Gentofte Hospital, Denmark
5. Clinical Nursing, Department of Intensive Care, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark