Langguth B, de Ridder D, Dornhoffer JL, Eichhammer P, Folmer RL, Frank E, Fregni F, Gerloff C, Khedr E, Kleinjung T, Landgrebe M, Lee S, Lefaucheur JP, Londero A, Marcondes R, Moller AR, Pascual-Leone A, Plewnia C, Rossi S, Sanchez T, Sand P, Schlee W, Pysch D, Steffens T, van de Heyning P, Hajak G. Controversy: Does repetitive transcranial magnetic stimulation/ transcranial direct current stimulation show efficacy in treating tinnitus patients? Brain Stimul. 2008 Jul; 1(3):192-205.