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Tags: *Bed Rest, 2000, American journal of obstetrics and gynecology, Cardiovascular/*epidemiology, Crane S S, Female, Fetal Membranes, Gaich S A, Hopkins M P, Humans, Kovacevich G J, Lavin J P, Lavin L M, Nelson D, Obstetric Labor, Pregnancy, Pregnancy Complications, Premature Rupture/*therapy, Premature/*therapy, Puerperal Disorders/epidemiology, Pulmonary Embolism/epidemiology, Retrospective Studies, Risk Factors, Stewart J, Venous Thrombosis/*epidemiology
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