1. Laboratory Medicine Department , La Paz University Hospital , Madrid , Spain
2. Endocrinology and Metabolism Laboratory , Helsinki University Hospital , Helsinki , Finland
3. Department of Medical Biochemistry and Pharmacology, Norwegian Porphyria Centre , Haukeland University Hospital , Bergen , Norway
4. Norwegian Organization for Quality Improvement of Laboratory Examinations (NOKLUS) , Haraldsplass Deaconess Hospital , Bergen , Norway
5. Department of Medical Biochemistry Atasehir, School of Medicine , Acibadem Mehmet Ali Aydınlar University , Istanbul , Türkiye
6. Laboratory Medicine , IRCCS San Raffaele Scientific Institute , Milan , Italy
7. Certe, Wilhelmina Ziekenhuis Assen , Assen , The Netherlands
8. Undergraduate Teaching, School of Medicine , University of Dundee , Dundee , Scotland