RT Journal Article SR Electronic T1 Pregnancy and isotretinoin therapy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 411 OP 413 DO 10.1503/cmaj.120729 VO 185 IS 5 A1 Choi, June Seek A1 Koren, Gideon A1 Nulman, Irena YR 2013 UL http://www.cmaj.ca/content/185/5/411.abstract