That there are multiple natural and human activities happening in tandem and having various, complex effects on the climate?

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Dr Nygren said the natural rate of multiple births was around 1%, but was between 20% and 40% for women who used assisted reproductive techniques.

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Ms. Siedman says such a time lag in getting the data out might result in a situation where there are still multiple natural-history studies in Sanfilippo syndrome.

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