RT Journal Article SR Electronic T1 Commercial ultrasound JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 593 OP 593-a DO 10.1503/cmaj.110-2037 VO 182 IS 6 A1 Cormode, Edward J. YR 2010 UL http://www.cmaj.ca/content/182/6/593.2.abstract