1. Department of Psychology, Faculty of Health Sciences, University of Deusto, 48007 Bilbao, Spain
2. Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114-1107, USA
3. Neurodegenerative Diseases Group, Biocruces Bizkaia Health Research Institute, 48903 Barakaldo, Spain
4. Department of Neurology, Cruces University Hospital, 48903 Barakaldo, Spain
5. Ophthalmology Department, Cruces University Hospital, 48903 Barakaldo, Spain
6. Department of Neurosciences, University of the Basque Country (UPV/EHU), 48940 Leioa, Spain
7. IKERBASQUE, The Basque Foundation for Science, 48009 Bilbao, Spain