Group prenatal care and preterm birth weight: results from a matched cohort study at public clinics
Ickovics JR, Kershaw TS, Westdahl C, Rising SS, Klima C, Reynolds H, Magriples U: Group prenatal care and preterm birth weight: results from a matched cohort study at public clinics. Obstet Gynecol. 2003 Nov. PMID: 14672486