Corrigendum: Frontal Connectivity in EEG Gamma (30–45 Hz) Respond to Spinal Cord Stimulation in Minimally Conscious State Patients - Bai, Yang; Xia, Xiaoyu; Liang, Zhenhu; Wang, Yong; Yang, Yi; He, Jianghong; Li, Xiaoli (Frontiers in Cellular Neuroscience, 2017)