1. Institute of Laboratory Medicine, Stadtspital Zürich, Triemli, 8063 Zurich, Switzerland
2. Division of Endocrinology, Diabetology, Porphyria and Clinical Nutrition, Stadtspital Zürich, Triemli, 8063 Zurich, Switzerland
3. Swiss Reference Centre for Porphyrias, Stadtspital Zürich, Triemli, 8063 Zurich, Switzerland
4. Department of Research and Development, Blood Transfusion Service Zurich, Swiss Red Cross, 8952 Schlieren, Switzerland
5. Department of Molecular Diagnostics and Cytometry, Blood Transfusion Service Zurich, Swiss Red Cross, 8952 Schlieren, Switzerland
6. Institute of Medical Genetics, University of Zürich, 8952 Schlieren, Switzerland