Depressive symptoms mediate the association between sleep disorders and gallstone disease: a causal mediation analysis of NHANES 2017–2020 - Hou, Yisen; Li, Rui; Xu, Zhen; Chen, Wenhao; Li, Zhiwen; Jiang, Weirong; Meng, Yong; Han, Jianli (Frontiers in Psychiatry, 2025)