1. Functional Motor Neuron Unit (UFMN), Department of Neurology, Bellvitge University Hospital, L’Hospitalet de Llobregat, Barcelona, Spain
2. IDIBELL (Institut d’Investigació Biomèdica de Bellvitge), L’Hospitalet de Llobregat, Barcelona, Spain
3. Department of Endocrinology and Clinical Nutrition, Bellvitge University Hospital, L’Hospitalet de Llobregat, Barcelona, Spain
4. Research Group on Statistics, Econometrics and Health (GRECS), University of Girona, Girona, Spain, and
5. CIBER of Epidemiology and Public Health (CIBERESP), Madrid, Spain