TY - JOUR T1 - Epidemiology and health risk assessment JF - Journal of Epidemiology and Community Health JO - J Epidemiol Community Health SP - 405 LP - 405 DO - 10.1136/jech.43.4.405 VL - 43 IS - 4 AU - Kevin Walsh Y1 - 1989/12/01 UR - http://jech.bmj.com/content/43/4/405.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -