title: [COX's proportional hazards model analysis for life span of patients with coal workers' pneumoconiosis].
authors.forename: Yi-ping
authors.initials: YP
authors.lastname: Shi
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Lv
mesh_terms: D006801:Humans; D011009:Pneumoconiosis / Q000401:mortality*; D016016:Proportional Hazards Models