RT Journal Article SR Electronic T1 Intrapartum pneumomediastinum associated with subcutaneous emphysema JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 641 OP 642 VO 139 IS 7 A1 Dudley, D. K. A1 Patten, D. E. YR 1988 UL http://www.cmaj.ca/content/139/7/641.abstract