Healthcare professionals' perceptions of system preparedness during public health emergencies: a path analysis of mental health impacts - Huang, Runze; Ding, Xueting; Li, Anlong; Nie, Guodong; Cheng, Ling; Li, Yajing; Gao, Wei; Ge, Han; Zhang, Mingjun; Cheng, Huaidong (Frontiers in Public Health, 2025)