1. Department of Medical Biosciences, Clinical Chemistry, Norrbotten County Council, Sunderby Hospital, Umeå University, Umeå, Sweden
2. Department of Public Health and Clinical Medicine, Family Medicine, Umeå University, Umeå, Sweden
3. Department of Public Health and Clinical Medicine, Skellefteå Research Unit, Umeå University, Umeå, Sweden
4. Department of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden
5. Department of Medical Biosciences, Clinical Chemistry, Umeå University, Umeå, Sweden