RT Journal Article SR Electronic T1 Advance directives to protect embryos? JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 497 OP 498 DO 10.1136/jme.2005.013607 VO 31 IS 9 A1 K Devolder YR 2005 UL http://jme.bmj.com/content/31/9/497.abstract AB