Multifocal tDCS targeting the resting state motor network increases cortical excitability beyond traditional tDCS targeting unilateral motor cortex - Fischer, DB; Fried, PJ; Ruffini, G; Ripolles, O; Salvador, R; Banus, J; Ketchabaw, WT; Santarnecchi, E; Pascual-Leone, A; Fox, MD (Neuroimage, 2017)