RT Journal Article SR Electronic T1 Cerebral atrophy and skull thickening due to chronic phenytoin therapy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 321 OP 323 DO 10.1503/cmaj.061171 VO 176 IS 3 A1 Chow, Kai Ming A1 Szeto, Cheuk Chun YR 2007 UL http://www.cmaj.ca/content/176/3/321.2.abstract