1. Institute of Medicine, Sahlgrenska Academy, University of Gothenburg , SE-405 30 Gothenburg , Sweden
2. Department of Endocrinology, Sahlgrenska University Hospital , 413 45 Gothenburg , Sweden
3. Wallenberg Centre for Molecular and Translational Medicine, University of Gothenburg , SE-405 30 Gothenburg , Sweden
4. Department of Public Health and Clinical Medicine, Umeå University , SE-901 87 Umeå , Sweden
5. Department of Surgery, Sahlgrenska University Hospital , 413 45 Gothenburg , Sweden
6. Department of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg , SE-405 30 Gothenburg , Sweden
7. Department of Molecular Medicine and Surgery, Karolinska Institutet , SE-171 77 Stockholm , Sweden
8. Department of Endocrinology, Karolinska University Hospital , SE-171 76 Stockholm , Sweden