TY - JOUR T1 - Gene therapy: two steps forward, one step back JF - Canadian Medical Association Journal JO - CMAJ SP - 1785 LP - 1786 DO - 10.1503/cmaj.1031262 VL - 170 IS - 12 AU - Josephine Johnston AU - Francoise Baylis Y1 - 2004/06/08 UR - http://www.cmaj.ca/content/170/12/1785.abstract ER -