Over half a million women die each year from complications during pregnancy, delivery or shortly afterward. To address the problem, the UN Population Fund is holding a high level maternal health meeting in Ethiopia. One of the Millennium Development Goals is to reduce maternal mortality by 75% by 2015. So which countries of the world are rising to the challenge and which are showing little evidence of improvement? The BBC has been looking at the situation for women giving birth in different countries. Listen to Lyse Doucet's report from Afghanistan.