Corrigendum: Combination therapy with fingolimod and neural stem cells promotes functional myelination in vivo through a non-immunomodulatory mechanism - Zhang, Yuan; Lu, Xin-Yu; Ye, Ze-Qin; Ciric, Bogoljub; Ma, Cun-Gen; Rostami, Abdolmohamad; Li, Xing; Zhang, Guang-Xian (Frontiers in Cellular Neuroscience, 2022)