比较效益研究的设计、实施和分析方法概述(6)
[24] Von Elm E， Altman D G， Pocock S J， et al. Strengthening the reporting of observational studies in epidemiology (STROBE) statement： guidelines for reporting observational studies [J]. Bri Med J， 2007，335：806.[25] Greenland S. Confounding and exposure trends in case-crossover and case-time-control designs[J]. Epidemiology ......
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