1. National Centre for Epilepsy Oslo University Hospital Oslo Norway
2. Department of Nutrition University of Oslo Oslo Norway
3. Faculty of Medicine University of Oslo Oslo Norway
4. Department of Neurology Oslo University Hospital Oslo Norway
5. Oslo Center of Biostatistics and Epidemiology Department of Biostatistics University of Oslo Oslo Norway
6. Department of Research and Development Division of Clinical Neuroscience Oslo University Hospital and the University of Oslo Oslo Norway