RT Journal Article SR Electronic T1 Risks of contraception and pregnancy in heart disease JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1520 OP 1525 DO 10.1136/hrt.2006.095240 VO 92 IS 10 A1 Sara Thorne A1 Anne MacGregor A1 Catherine Nelson-Piercy YR 2006 UL http://heart.bmj.com/content/92/10/1520.abstract AB