RT Journal Article SR Electronic T1 Black hairy tongue: What is your call? JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1137 OP 1138 DO 10.1503/cmaj.071611 VO 178 IS 9 A1 Emmet E. McGrath, MB A1 Philip Bardsley MD A1 Gurnan Basran MD YR 2008 UL http://www.cmaj.ca/content/178/9/1137.abstract