Assessment of upper GI motor activity and GI symptoms in patients with amyotrophic lateral sclerosis: an observational study - Ribichini, Emanuela; Pallotta, Nadia; Badiali, Danilo; Carlucci, Maria; Ceccanti, Marco; Cambieri, Chiara; Libonati, Laura; Corazziari, Enrico Stefano; Ruoppolo, Giovanni; Inghilleri, Maurizio (Frontiers in Neurology, 2025)