1 Expert Centre Chronic Fatigue, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands 2 Department of Clinical Neurophysiology, Institute of Neurology, Radboud University Nijmegen Medical ...
5 Laboratory of Epidemiology and Biostatistics, Istituto Superiore di Sanità, Rome, Italy 6 Department of Opthalmology, University of Sassari, Sassari, Italy Correspondence to: Dr Arturo Carta, ...