RT Journal Article SR Electronic T1 Muehrcke lines JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E239 OP E239 DO 10.1503/cmaj.120269 VO 185 IS 5 A1 Vishal Sharma A1 Vivek Kumar YR 2013 UL http://www.cmaj.ca/content/185/5/E239.abstract AB