Interacting and joint effects of assisted reproductive technology and gestational diabetes mellitus on preterm birth and the mediating role of gestational diabetes mellitus: a cohort study using a propensity score. - Xiang YX; Xu Z; Xiao R; Yao YL; Tang XJ; Fu LJ; Geng LH; Zhong ZH; Ding YB (Journal of assisted reproduction and genetics, 2025)