Impact of sperm DNA fragmentation index on assisted reproductive outcomes: a retrospective analysis - Yang, Bin; Xia, Leizhen; Deng, Rufei; Wu, Liping; Zhang, Zhiqin; Wu, Xingwu; Ding, Tao; Zhao, Yan; Huang, Jialyu; Huang, Zhihui (Frontiers in Endocrinology, 2025)