EditorialIntroducing the “Level of Evidence” to Obstetrics & GynecologySpong, Catherine Y.; Scott, James R.Obstetrics & Gynecology: January 2004 - Volume 103 - Issue 1 - p 1-2 doi: 10.1097/01.AOG.0000104484.04069.D4 Buy Metrics © 2004 The American College of Obstetricians and Gynecologists