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22 Proportional hazards modeling, 23 stratified by whether chemotherapy had been administered and by randomization option two or four arm, 17 was used to investigate predictors of DFS and to estimate hazard ratios HRs, 95 CI, and to assess interactions of the treatment effect with Ki 67 LI and other prognostic variables costo levitra 10 mg in farmacia 80 Diet 15 Training 5 gear