Clinicogenetic characterization and response to disease-modifying therapies in spinal muscular atrophy: real-world experience from a reference center in Southern Brazil Ana Letícia Amorim de Albuquerque; Júlia Kersting Chadanowicz; Isabela Possebon Bevilacqua; Ana Lucia Portella Staub; Pablo Brea Winckler; Patricia Zambone da Silva; Simone Chaves Fagondes; Renata Salatti Ferrari; Claudia Denise de Oliveira Trojahn; Viviane Zechlinski Sacharuk; Thayne Woycinck Kowalski; Karina Carvalho Donis; Michele Michelin Becker; Jonas Alex Morales Saute;