Expanded mosaic chromosomal alterations, frailty, and risks of all-cause and cause-specific mortality among Chinese and the UK adults: evidence from two prospective cohorts - Mingyu Song; Zilun Shao; Yuting Han; Yuxuan Zhao; Jun Lv; Canqing Yu; Pei Pei; Ling Yang; Iona Y. Millwood; Robin G. Walters; Yiping Chen; Huaidong Du; et al. (BMC Medicine, 2025)