1. Department of Nursing and health sciences University of Southeastern Norway Borre Norway
2. Department of Anaesthesia Vestfold Hospital Trust Tønsberg Norway
3. Department of Anaesthesia Ringerike Hospital Hønefoss Norway
4. Department of Health, Welfare and Organization Østfold University College Østfold Norway
5. Department of Anaesthesia Østfold Hospital Trust Østfold Norway