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Forest plots of secondary outcomes: a response rate, b remission rate. mono = tDCS alone; +medicine = tDCS + medication; +psycho = tDCS + psychotherapy; +ECT = tDCS + ECT. SMD, standardised mean difference; OR, odds ratio; CI, confidence interval. aStimulation duration is 30 minutes. bStimulation duration is 20 min. “Excluded” in brackets means the events in both active and sham groups are zero, and thus, the study was excluded from further analysis
