This User’s Guide is a resource for investigators and stakeholders who develop and review observational comparative effectiveness research protocols. It expla

Planning clinical research requires many decisions. The authors of this book explain key decisions with examples showing what works and what does not.

Praise for the Second Edition: "... this is a useful, comprehensive compendium of almost every possible sample size formula. The strong organization and careful

Introductory Chapter: The Contribution of Cohort Studies to Health Sciences.

The Encyclopedic Reference of Public Health presents the most important definitions, principles and general perspectives of public health, written by experts of