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Each year between 50 000 to 100 000 women worldwide are affected by obstetric fistula, a hole in the birth canal. 全世界每年有5萬(wàn)至10萬(wàn)名婦女罹患產(chǎn)科瘺，即產(chǎn)道出現(xiàn)瘺孔。