1. Norwegian Porphyria Centre (NAPOS); Laboratory of Clinical Biochemistry; Haukeland University Hospital; Bergen Norway
2. Department of Global Public Health and Primary Care; University of Bergen; Bergen Norway
3. Norwegian Quality Improvement of Laboratory Examinations (NOKLUS); Haraldsplass Deaconess Hospital; Bergen Norway
4. Western Norway University of Applied Sciences; Bergen Norway
5. Centre for Disease Burden; Domain for Mental and Physical Health; Norwegian Institute of Public Health; Bergen Norway