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Some 35 million abortions occur in developing countries each year. Approximately 20 million of these are unsafe abortions which claim the lives of 67000 women as a result of related complications. These deaths represent 13% of all pregnancy-related mortality and in some countries as much as 25% of maternal deaths. In developing countries one of every 75 women die of pregnancy- or childbirth-related causes compared to one of every 7300 women in developed countries.
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Curtis et al. (2010) studied this question.