RT Journal Article SR Electronic T1 Postpartum pneumomediastinum (Hamman's syndrome) JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 32 OP 32 DO 10.1503/cmaj.061581 VO 177 IS 1 A1 Majer, Sabine A1 Graber, Peter YR 2007 UL http://www.cmaj.ca/content/177/1/32.abstract