Marie Tarrant*, Daniel YT Fong, Kendra M Wu, Irene LY Lee, Emmy MY Wong, Alice Sham, Christine Lam and Joan E Dodgson
* Corresponding author: Marie Tarrant tarrantm@hku.hk
BMC Pregnancy and Childbirth 2010, 10:27 doi:10.1186/1471-2393-10-27