Erratum to: Surg Endosc DOI 10.1007/s00464-012-2568-x

On the first page of the article, second paragraph, third line, the response rate should be 70 %, not 75 %.

The same correction to the response rate also applies to the text on the second page, third paragraph, second line.

In addition, C. C. Wee should also be considered as the corresponding author.