1. The Swedish Red Cross University College; Stockholm Sweden
2. Danderyd Hospital, Division of Anaesthesia and Intensive Care, Department of Clinical Sciences; Karolinska Institutet; Stockholm Sweden
3. Bactiguard AB; Stockholm Sweden Sweden
4. Department Anesthesia and Intensive Care; Karolinska University Hospital Huddinge; Stockholm Sweden
5. CLINTEC, Karolinska Institutet; Stockholm Sweden