Corrigendum to: Aristolochic acid I induces impairment in spermatogonial stem cell in rodents. Issue 4 (18th June 2021) - Liu, Yongzhen; He, Xiang; Wang, Yuli; Zhou, Houzu; Zhang, Yuan; Ma, Jianyun; Wang, Zhaochu; Yang, Fangfang; Lu, Henglei; Yang, Yifu; Deng, Zhongping; Qi, Xinming; et al.