1. Neuroendocrine Cell Biology, Lund University Diabetes Centre , Malmö 20502 , Sweden
2. Department of Clinical Sciences, Lund University , Malmö 20502 , Sweden
3. Turku PET Centre, University of Turku , Turku 20520 , Finland
4. Department of Gastroenterology, Turku University Hospital , Turku 20520, Finland
5. Division of Digestive Surgery and Urology, Turku University Hospital , Turku 20520, Finland
6. Department of Endocrinology, Turku University Hospital , Turku 20520 , Finland