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Medical Statistics
A Textbook for the Health Sciences
Fifth Edition
Stephen J. Walters
Medical Statistics GroupSchool of Health and Related ResearchUniversity of SheffieldSheffield, UK
Michael J. Campbell
Medical Statistics GroupSchool of Health and Related ResearchUniversity of SheffieldSheffield, UK
David Machin
Medical Statistics GroupSchool of Health and Related ResearchUniversity of SheffieldLeicester Cancer Research