Further Observations on Prematurity and Perinatal Mortality in a General Population and in the Population of a Prepaid Group Practice Medical Care PlanSam Shapiro, Louis Weiner, H Jacobziner et al.|American Journal of Public Health and the Nations Health|1960Cited by 59
Comparison of Prematurity and Perinatal Mortality in a General Population and in the Population of a Prepaid Group Practice, Medical Care PlanSam Shapiro, Paul M. Densen, Louis Weiner|American Journal of Public Health and the Nations Health|1958Cited by 58