RT Journal Article SR Electronic T1 Sociobiology. JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 158 OP 160 DO 10.1136/jme.10.3.158 VO 10 IS 3 A1 M Midgley YR 1984 UL http://jme.bmj.com/content/10/3/158.abstract AB