RT Journal Article SR Electronic T1 True blue: a puzzling case of persistent cyanosis in a young child JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 734 OP 737 DO 10.1503/cmaj.070109 VO 180 IS 7 A1 Michelle Porepa A1 Lee Benson A1 David E. Manson A1 Jeremy N. Friedman YR 2009 UL http://www.cmaj.ca/content/180/7/734.abstract