TY - BOOK AU - Friis,Robert H. AU - Sellers,Thomas A. TI - Epidemiology for public health practice SN - 0763751618 AV - RA651 .F686 2008 U1 - 614.4 21 PY - 2008/// CY - Sudbury, Mass. PB - Jones and Bartlett KW - Epidemiology KW - Public health personnel KW - Public Health N1 - Includes bibliographical references and index ER -