TY - JOUR T1 - Modern epidemiology JF - Journal of Epidemiology and Community Health JO - J Epidemiol Community Health SP - 263 LP - 263 DO - 10.1136/jech.41.3.263 VL - 41 IS - 3 AU - J Mark Elwood Y1 - 1987/09/01 UR - http://jech.bmj.com/content/41/3/263.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -