<style face="normal" font="default" size="100%">Trends in twin births in NSW, Australia, 1990-1999</style>

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0<style face="normal" font="default" size="100%">Trends in twin births in NSW, Australia, 1990-1999</style><style face="normal" font="default" size="100%">Trends in twin births in NSW, Australia, 1990-1999</style>