DFID draws on the analysis of the United Nations Population Fund (UNFPA) and the World Health Organisation (WHO) for data regarding obstetric fistula and does not conduct its own assessments. WHO estimates that more than two million women and girls are living with fistula in developing countries, with 50,000 to 100,000 new cases occurring each year. However, these figures are based on the number of women seeking treatment and are likely to be gross underestimates. The full extent of the problem has never been mapped and reliable data on obstetric fistula is scarce. In 2004 UNFPA and EngenderHealth conducted a groundbreaking needs assessment study in nine African countries to provide the basis of our understanding on obstetric fistula in sub-Saharan Africa.