Quantifying the impacts of volume-based procurement policy on spatial accessibility of antidepressants via generic substitution: A four-city cohort study using drug sales data - Aoming Xue; Qingyuan Xue; Jiahong Fu; Keye Fan; Jiale Zhang; Peiyan Cai; Yuanyuan Kuang; Yingsong Chen; Jifang Zhou; Bin Jiang (PLoS ONE, 2025)