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1. Estimating sample size and power : applications and examples / Warren S. Browner, Thomas B. Newman, Stephen B. Hulley Analítico Availability No copies available

2. Enhancing causal inference in observational studies / Thomas B. Newman, Warren S. Browner, Stephen B. Hulley Analítico Availability No copies available

3. Getting ready to estimate sample size : hypotheses and underlying principles / Warren S. Browner, Thomas B. Newman, Stephen B. Hulley Analítico Availability No copies available

4. Conceiving the research question / Steven R. Cummings, Warren S. Browner, Stephen B. Hulley Analítico Availability No copies available