TY - BOOK AU - Gordis,Leon TI - Epidemiology SN - 9781416040026 AV - RA651 .G58 2009 U1 - 614.4 22 PY - 2009/// CY - Philadelphia PB - Elsevier/Saunders KW - Epidemiology KW - Epidemiologic Methods N1 - Include index ER -