Gamma tACS as a novel treatment for primary progressive aphasia: A pilot case series of four cases. - Etelämäki V; Säisänen L; Määttä S; Hyppönen J; Suhonen NM; Krüger J; Haapasalo A; Borroni B; Mervaala E; Katisko K; Solje E (Brain stimulation, 2026)