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American college of obstetricians and gynecologists practice bulletins: Ascertaining their citation, influence, and utilization
作者单位：Department of Maternal Fetal Medicine, Eastern Virginia Medical School, Norfolk, VA, United States[1]Department of Obstetrics and Gynecology, University of Wisconsin, School of Medicine and Public[2]Center for Urban Population Health, Aurora Sinai Medical Center, 1020 N. 12th Street, Milwaukee WI[3]Lake Erie College of Osteopathic Medicine, Greensburg, PA, United States[4]
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