1. Department of Prosthodontics; School of Dentistry; Faculty of Medicine and Health Sciences; University of Barcelona; L'Hospitalet de llobregat Barcelona Spain
2. Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute); IDIBELL; L'Hospitalet de llobregat Barcelona Spain
3. ALS Unit; Department of Neurology; Bellvitge University Hospital; L'Hospitalet de llobregat Barcelona Spain