RT Journal Article SR Electronic T1 Harlequin masks JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1043 OP E1043 DO 10.1503/cmaj.110532 VO 183 IS 13 A1 Ronald H. Lands YR 2011 UL http://www.cmaj.ca/content/183/13/E1043.abstract