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Skip Navigation LinksHome > September 2010 - Volume 116 - Issue 3 > The Natural History of the Normal First Stage of Labor
Obstetrics & Gynecology:
doi: 10.1097/AOG.0b013e3181ee9ff3
Departments: Letters to the Editor

The Natural History of the Normal First Stage of Labor

Zhang, Jun PhD, MD; Fraser, William MD, MS; Troendle, James PhD; Sundaram, Rajeshwari PhD

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