Levine RJ, Hauth JC, Curet LB, Sibai BM et al
Trial of calcium to prevent preeclampsia
N Engl J Med
(Jul) 337:69-76 1997

The abstract of this paper is available from the National Library of
Medicine's PubMed site:
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For accompanying editorial by James M. Roberts:
Click here. Make sure you also click on the reference
section
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cited.