The above article from Korean J Obstet Gynecol, published on May 2009, has been retracted by agreement between the authors, the journal Editor-in-Chief, professor Pil Ryang Lee, and publication office of Korean J Obstet Gynecol.

The authors' statement follows below

In 2009, we published two articles associated with the effect of HER-2 polymorphism on endometrial cancer. One article appeared in Korean J Obstet Gynecol and the other appeared in BJOG [1]. Specifically, the opening to the readers (including the opening in the online publication) of the two articles are similar. Although the article published in BJOG was designed, written, submitted and accepted earlier, we did not cite the article from BJOG because it had not yet been printed at that time. Thus, in order to make clearance for referencing issue between Korean J Obstet Gynecol and BJOG, we decided to retract the paper published in Korean J Obstet Gynecol. We regret the inadvertent omission of the appropriate referencing and offer sincere apologies to readers for any inconvenience caused by this retraction.