1. Intensive Care Unit, University Hospital of Ioannina, University of Ioannina, 45500 Ioannina, Greece
2. Department of Emergency Medicine, “Hippokration” Hospital, 11527 Athens, Greece
3. Pain and Rehabilitation Centre, Department of Health, Medicine and Caring Sciences, Linköping University, SE-581 83 Linköping, Sweden
4. Laboratory of Psychology of Patients, Families & Health Professionals, Department of Nursing, School of Health Sciences, University of Ioannina, 45500 Ioannina, Greece