Serum and CSF alpha-synuclein levels do not change in COVID-19 patients with neurological symptoms - Blanco-Palmero, VA; Azcárate-Díaz, FJ; Ruiz-Ortiz, M; Laespada-García, MI; Rábano-Suárez, P; Méndez-Guerrero, A (J Neurol, 2021)