1. Hospital of Stomatology, Guanghua School of Stomatology , Sun Yat-sen University, South China Center of Craniofacial Stem Cell Research, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055 , China
2. Fujian Key Laboratory of Developmental and Neural Biology and Southern Center for Biomedical Research, College of Life Sciences , Fujian Normal University, Fuzhou 350117 , China
3. Research and Development Center for Tissue Engineering, The Fourth Military Medical University , Xi’an 710032 , China