RT Journal Article SR Electronic T1 Subcutaneous emphysema and tension pneumomediastinum JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 604 OP 604 DO 10.1136/emermed-2012-202093 VO 30 IS 7 A1 Federica Stella A1 Edoardo Rossi A1 Franco Tosato YR 2013 UL http://emj.bmj.com/content/30/7/604.abstract AB