1. Department of Nuclear Medicine, Institut de Diagnòstic per la Imatge (IDI), Hospital General Universitari Vall d’Hebrón, Universitat Autònoma de Barcelona, Barcelona, Spain
2. Department of Nuclear Medicine, Gammagrafía Corachan, Barcelona, Spain
3. Department of Neurology, Hospital General Universitari Vall d’Hebrón, Barcelona, Spain
4. Fundació ACE, Institut Català de Neurociències Aplicades, Barcelona, Spain
5. Department of Nuclear Medicine, Hospital General Universitario Gregorio Marañón, Madrid, Spain
6. Department of Radiology, Hospital General Universitario Gregorio Marañón, Madrid, Spain
7. Department of Clinical, Instituto Grifols, S.A., Barcelona, Spain