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Risk factors of treatment default and death among tuberculosis patients in a resource-limited settin
Objective:To evaluate the rates,timing and determinants of default and death among adult tuberculosis patients in Nigeri......
目的：了解重庆市食品污染现状。方法：在严格的质量控制下，按照统一的方法，选择市内有代表性的28个食品污染状况调查采样点，采取随机抽样......
