title: Correction.
abstract: In Reviews in Obstetrics & Gynecology, Volume 4, Number 1 on page 34 [Rev Obstet Gynecol. 2011;4(1):34 doi 10.3909/riog0145d], a typographical error resulted in an incorrect value. Simon and colleagues reported on the safety of 10 μg of 17β-estradiol, not 10 mg.The editorial staff of Reviews in Obstetrics & Gynecology carefully reviews each issue, attempting to ensure that all of the information presented is correct and complete. Occasionally, however, something gets past us and makes it into print. We apologize for any inconvenience this error may have caused you.[This corrects the article on p. 34 in vol. 4.].