1. Alzheimer's Disease and Other Cognitive Disorders Unit, Neurology Service, Hospital Clínic, Barcelona, Spain
2. Department de Psiquiatria i Psicobiologia Clinica, Universitat de Barcelona, Spain
3. Institut d'Investigació Biomédica August Pi i Sunyer (IDIBAPS), Barcelona, Spain
4. Radiology Service, Hospital Clínic de Barcelona, Spain