Ongoing Oscillatory Electrophysiological Alterations in Frail Older Adults: A MEG Study - Suarez-Mendez, Isabel; Walter, Stefan; Lopez-Sanz, David; Pasquin, Natalia; Bernabe, Raquel; Castillo Gallo, Ernesto; Valdes, Myriam; del Pozo, Francisco; Maestu, Fernando; Rodriguez-Manas, Leocadio; (Frontiers In Aging Neuroscience, 2021)