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1701. Outcomes in COPD patients treated with theophylline (pdf file)
      effectivehealthcare-admin.ahrq.gov/sites/default/files/decide16final-mortality-risk-in-copd-pts-using-theophylline.pdf
      December 01, 2009 - We included patients with theophylline (N=27,052) and a 35% random sample of the remaining cohort from … However, because of the small sample of patients none of the results were statistically significant. … Sample selection used to identify the analytic cohort included in the time-varying exposure analysis

1702. Outcomes in COPD patients treated with theophylline (pdf file)
      effectivehealthcare-admin.ahrq.gov/sites/default/files/pdf/copd-management_research.pdf
      December 01, 2009 - We included patients with theophylline (N=27,052) and a 35% random sample of the remaining cohort from … However, because of the small sample of patients none of the results were statistically significant. … Sample selection used to identify the analytic cohort included in the time-varying exposure analysis