Maternal mortality estimates:global progress on levels and trends

Hogan MC, Foreman KJ, Naghavi M, Ahn SY, Wang M, Makela SM, Lopez AD, Lozano R, Murray CJL. Maternal mortality for 181 countries, 1980-2008: a systematic analysis of progress towards Millennium Development Goal 5. The Lancet. 2010 May 8; 375:1609–1623. Published online first April 12, 2010.