TY - BOOK AU - Timmreck,Thomas C. TI - An introduction to epidemiology SN - 9780763700607 (pbk.) AV - RA651 .T56 2002 U1 - 614.4 21 PY - 2002/// CY - Sudbury, Mass. PB - Jones and Bartlett Publishers KW - Epidemiology KW - Epidemiologic Methods N1 - Includes bibliographical references and index ER -