TY - BOOK AU - Armitage,P. AU - Berry,G. AU - Matthews,J.N.S. TI - Statistical methods in medical research SN - 9780632052578 PY - 2002/// CY - Oxford, Malden, MA PB - Blackwell Science KW - Biometry KW - Research Design N1 - Includes bibliographical references (p. 760-783) and indexes ER -