Ulrica Nilsson1, Lina Bergman2. 1. Division of Nursing, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden; Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden. Electronic address: ulrica.nilsson@ki.se. 2. Division of Nursing, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden.