. 2008 Dec;115(13):1630–1640. doi: 10.1111/j.1471-0528.2008.01942.x
© 2008 The Authors Journal compilation © RCOG 2008 BJOG An International Journal of Obstetrics and Gynaecology
Re-use of this article is permitted in accordance with the Creative Commons Deed, Attribution 2.5, which does not permit commercial exploitation.