RT Journal Article SR Electronic T1 Quantitative Risk Assessment JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 53 OP 54 DO 10.1136/jme.15.1.53 VO 15 IS 1 A1 Barnard, George A YR 1989 UL http://jme.bmj.com/content/15/1/53.abstract AB