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McPheeters ML, Miller WC, Hartmann KE, Savitz DA, Kaufman JS, Garrett JM, Thorp JM. The epidemiology of threatened preterm labor: a prospective cohort study. American journal of obstetrics and gynecology. 2005 Apr;192(192). 1325-9; discussion 1329-30.
Abstract
The purpose of this study was to describe the occurrence, timing, and outcomes of hospital-based diagnoses of preterm labor.