1. Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
2. Division of Anaesthesiology and Intensive Care, Department of Clinical Science Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
3. Department of Upper Gastrointestinal Diseases, Karolinska University Hospital, Stockholm, Sweden
4. Department of Medicine, Karolinska Institutet, Stockholm, Sweden