TY - BOOK AU - Wassertheil-Smoller,Sylvia TI - Biostatistics and epidemiology: a primer for health and biomedical professionals SN - 0387402926 (alk. paper) U1 - 614.4072 22 PY - 2004/// CY - New York PB - Springer-Verlag KW - Epidemiology KW - Statistical methods KW - Clinical trials N1 - Includes bibliographical references (p. 227-231) and index ER -