1. Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden;
2. Department of Medicine, Piteå Hospital, Piteå, Sweden;
3. Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden;
4. Clinical Genetics, Laboratory Medicine, Department of Medical Bioscience/Medical and Clinical Genetics, Umeå University, Umeå, Sweden;
5. Wallenberg Centre for Molecular Medicine, Umeå University, Umeå, Sweden