1. Doctorial Student, Department of Medicine and Care, Division of Nursing Science, Linköping University, Linköping, Sweden,
2. Associate Professor, Sleep Disorders Unit, University Hospital, Uppsala, Sweden,
3. Associate Professor, Department of Cardiothoracic Surgery, University Hospital, Linköping, Sweden,
4. Professor Emeritus, Department of Medicine and Care, Division of Nursing Science, Linköping University, Linköping, Sweden