1. Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
2. Department of Neurology, ME Neurology, Karolinska University Hospital, Stockholm, Sweden
3. Unit of Integrative Epidemiology, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
4. Methodology and Statistics Unit, Institute of Psychology, Leiden University, Leiden, The Netherlands
5. Medical Radiation Physics and Nuclear Medicine Imaging, Section for Nuclear Medicine, Karolinska University Hospital, Stockholm, Sweden, and
6. Institute of Cognitive Sciences and Technologies, Italian National Research Council, Rome, Italy