RT Journal Article SR Electronic T1 Chest tightness and mediastinal widening JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 255 OP 256 DO 10.1503/cmaj.080737 VO 179 IS 3 A1 Ruan, Sheng-Yuan A1 Jerng, Jih-Shuin YR 2008 UL http://www.cmaj.ca/content/179/3/255.abstract