TY - BOOK AU - Gordis,Leon TI - Epidemiology SN - 072168338X (pbk.) AV - RA651 .G58 2000 U1 - 614.4 21 PY - 2000/// CY - Philadelphia PB - W.B. Saunders KW - Epidemiology KW - Epidemiologic Methods N1 - Includes bibliographical references and index ER -