RT Journal Article SR Electronic T1 Sex in pregnancy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 815 OP 818 DO 10.1503/cmaj.091580 VO 183 IS 7 A1 Claire Jones A1 Crystal Chan A1 Dan Farine YR 2011 UL http://www.cmaj.ca/content/183/7/815.abstract AB