RT Journal Article SR Electronic T1 Where are we going with preimplantation genetic diagnosis? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1445 OP 1446 DO 10.1503/cmaj.061690 VO 176 IS 10 A1 Timothy Krahn YR 2007 UL http://www.cmaj.ca/content/176/10/1445.abstract