Deborah A McNeil*, Monica Vekved, Siobhan M Dolan, Jodi Siever, Sarah Horn and Suzanne C Tough
* Corresponding author: Deborah A McNeil debbie.mcneil@albertahealthservices.ca
BMC Pregnancy and Childbirth 2012, 12:17 doi:10.1186/1471-2393-12-17