RT Journal Article SR Electronic T1 Substantia Nigra MR Imaging Signal Changes and Cardiomyopathy Following Prenatal Exposure to Cocaine and Heroin JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A0966 A1 R. Arnold A1 C. Johnson A1 B. McNulty A1 G. Gaisie YR 2008 UL http://www.ajnr.org/content/early/2008/01/17/ajnr.A0966.abstract AB