RT Journal Article SR Electronic T1 Intermittent forearm cyanosis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 287 OP 288 DO 10.1503/cmaj.061759 VO 178 IS 3 A1 Roger W. Simon MD A1 Beatrice R. Amann-Vesti MD YR 2008 UL http://www.cmaj.ca/content/178/3/287.abstract