RT Journal Article SR Electronic T1 Human enhancement and factor X JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 102 OP 103 DO 10.1136/jme.2006.019919 VO 34 IS 2 A1 F Simonstein YR 2008 UL http://jme.bmj.com/content/34/2/102.abstract AB