AUTHOR=Hu Zhen-Yu , Liu Xiaoli , Zheng Hong , Zhou Dong-Sheng TITLE=Commentary: Efficacy and Safety of Transcranial Direct Current Stimulation as an Add-on Treatment for Bipolar Depression: A Randomized Clinical Trial JOURNAL=Frontiers in Human Neuroscience VOLUME=12 YEAR=2018 URL=https://www.frontiersin.org/journals/human-neuroscience/articles/10.3389/fnhum.2018.00480 DOI=10.3389/fnhum.2018.00480 ISSN=1662-5161