Synergistic effects of simultaneous transcranial direct current stimulation (tDCS) and transcutaneous auricular vagus nerve stimulation (taVNS) on the brain responses - Sun, Jin-Bo; Tian, Qian-Qian; Yang, Xue-Juan; Deng, Hui; Li, Nan; Meng, Ling-Xia; Zhao, Zi-Xuan; Zhu, Yuan-Qiang; Xi, Yi-Bin; Yang, Qun; Qin, Wei (Brain stimulation, 2021)