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Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States https://t.co/JQfkf2ZT7i
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Trends in Frequency of Twins & Higher-Order Multiple Births in Canada & US http://t.co/Z4bZf3BF
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Trends in Frequency of Twins & Higher-Order Multiple Births in Canada & US http://t.co/HfcTkpsy
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Research: Temporal trends in the frequency of twins and higher-order multiple births in Canada and the United States http://t.co/EwbiR3rH
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The rates of #twin, #triplet, and higher-order multiple births continue to rise in the US and Canada: http://t.co/tnZcGN1W
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The rates of #twin, #triplet, and higher-order multiple births continue to rise in the US and Canada: http://t.co/tnZcGN1W