Impact of diagnosis-related group–based bundled payment on hospitalization costs and clinical outcomes in total hip arthroplasty: an interrupted time series analysis from Wenzhou, China - KeCheng Li; XiaoChan Xiang; Weiwei Zeng; Ge Li; JianWu Shi; XiaoLi Gao; QianWen Ye (Frontiers in Public Health, 2026)