1 Department of Clinical and Experimental Epilepsy, NIHR University College London Hospitals Biomedical Research Centre, UCL Institute of Neurology, London, UK Epilepsy Society, Chalfont St Peter, UK Neuroscience Department, Polytechnic University of Marche, Ancona, Italy.
2 Royal Victoria Infirmary, Newcastle-Upon Tyne, UK.
3 Division of Metabolic Diseases, Department of Laboratory Medicine, Porphyria Centre Sweden, Karolinska University Hospital and Karolinska Institute, Stockholm, Sweden.
4 Department of Clinical and Experimental Epilepsy, NIHR University College London Hospitals Biomedical Research Centre, UCL Institute of Neurology, London, UK Epilepsy Society, Chalfont St Peter, UK.