1 Department of Clinical Sciences, Division of Anaesthesia and Intensive Care, Danderyd Hospital, Karolinska Institutet, SE-182 88 Stockholm, Sweden. Electronic address: claes.frostell@ki.se.
2 Department of Clinical Sciences, Division of Anaesthesia and Intensive Care, Danderyd Hospital, Karolinska Institutet, SE-182 88 Stockholm, Sweden; The Swedish Red Cross University College, Huddinge, Sweden.
3 School of Chemical Science and Engineering, Fibre and Polymer Technology, KTH Royal Institute of Technology, Stockholm, Sweden.
4 Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim, Norway.