Randomization and Blinding Prior to the treatment phase, study participants were randomized in a 2 : 1 ratio in blocks of four randomizations (by OT) to receive either (1) active tDCS stimulation or (2) sham tDCS stimulation. Participants were asked to continue their routine medication regimen throughout the trial. The staff who generated the random allocation sequence, enrolled participants, and assigned participants to interventions were not involved in any assessments. After assignment to the intervention groups, the pediatric neurologist who carried out the seizure assessments (NA) was blind to treatment condition. Because the study participants were also blind to treatment condition, this is a double-blind study.