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Comparison of Prematurity and Perinatal Mortality in a General Population and in the Population of a Prepaid Group Practice, Medical Care Plan Sam Shapiro, Louis Weiner, and Paul M. Densen CopyRight https://doi.org/10.2105/AJPH.48.2.170 Published Online: August 29, 2011
Shapiro et al. (Sat,) studied this question.