Corrigendum: Bioactive Sr2+/Fe3+ co-substituted hydroxyapatite in cryogenically 3D printed porous scaffolds for bone tissue engineering (2021 Biofabrication13035007). (13th October 2021) - Yang, Liang; Ullah, Ismat; Yu, Keda; Zhang, Wancheng; Zhou, Jinge; Sun, Tingfang; Shi, Lei; Yao, Sheng; Chen, Kaifang; Zhang, Xianglin; Guo, Xiaodong