1. Department of Medical Sciences, Gastroenterology and Hepatology Unit, Uppsala University Hospital, Uppsala University, Uppsala, Sweden;
2. Clinical Sciences, Biohit Oyj, Helsinki, Finland;
3. Research Unit on Acetaldehyde and Cancer, University of Helsinki, Helsinki, Finland;
4. Laboratory of Organic Chemistry, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, Turku, Finland;
5. Clinical Trial Consultants, Uppsala University Hospital, Uppsala, Sweden