Robson Stephen, Adair Steven, Bland Peter
Department Of Obstetrics And Gynaecology, Australian National University Medical School, The Canberra Hospital, Australian Capital Territory, Australia.
Aust N Z J Obstet Gynaecol. 2005 Jun;45(3):250-1. doi: 10.1111/j.1479-828X.2005.00398.x.