Forty-five patients suffering a moderate to severe depressive episode were randomized to receive 15 sessions of either conventional rTMS of the left DLPFC ( `` butterfly-rTMS '' ; 10Hz ; 2000 stimuli/day , RMT 110 % ) , mediofrontal double cone coil stimulation of the anterior cingulate cortex ( `` ACDC-rTMS '' with equal parameters ) , or sham-stimulation .