A pilot study on effects of 4×1 High-Definition tDCS on motor cortex excitability. - Egas M. Caparelli-Daquer; Trelawny J. Zimmermann; Eric Mooshagian; Lucas C. Parra; Justin K. Rice; Abhishek Datta; Marom Bikson; Eric M. Wassermann (EMBC, 2012)