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Is the natural twinning rate still declining?
Herskind AM, Basso O, Olsen J, Skytthe A, Christensen K. Herskind AM, et al. Epidemiology. 2005 Jul;16(4):591-2. doi: 10.1097/01.ede.0000165816.03286.c7. Epidemiology. 2005. PMID: 15951683 No abstract available.
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