What limits a bystander’s action to perform cardiopulmonary resuscitation in China? Insights from a cross-sectional study conducted in Shaanxi Province - Dongdong Li; Kun Wang; Qiang Fu; Yan Li; Wangang Guo; Xiaolan Guo; Xin Zhang; Yuchan Hu; Liping Liao; Zhuoni Ma; Xin Chen; Miaomiao Cheng (Frontiers in Public Health, 2026)