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Saraiya, M., Berg, C.J., Shulman, H., Green, C.A. and Atrash, H.K. (1999) Estimates of the Annual Number of Clinically Recognized Pregnancies in the United States, 1981-1991. American Journal of Epidemiology, 149, 1025-1029.
https://doi.org/10.1093/oxfordjournals.aje.a009747
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