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letter . 1997 Dec 6;315(7121):1542. doi: 10.1136/bmj.315.7121.1542
Factors influencing relative weights of placenta and newborn infant. Maternal haemoglobin and blood pressure should have been regarded as continuous variables.
PMCID: PMC2127935 PMID: 9420514
See the article "Prospective cohort study of factors influencing the relative weights of the placenta and the newborn infant." in volume 314 on page 1864.