1. Division of Molecular Metabolism, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, S-171 76 Stockholm, Sweden.
2. Max Planck Institute Biology of Ageing - Karolinska Institutet Laboratory, Karolinska Institutet, S-171 77 Stockholm, Sweden.
3. Center for Inherited Metabolic Diseases, Karolinska University Hospital, S-171 76 Stockholm, Sweden.
4. Department of Mitochondrial Biology, Max Planck Institute for Biology of Ageing, D-50931 Cologne, Germany.