Erratum to: Surg Endosc DOI 10.1007/s12350-014-9978-1

The Acknowledgment statement in the article lists the incorrect grant numbers. The following is the corrected Acknowledgment statement.

Acknowledgments

This work was supported by the Natural Science Foundation of China (81071177 and 81130029), Beijing Municipal Science and technology project (No. Z131107002213181), PUMC Youth Fund and the Fundamental Research Funds for the Central Universities (3332013105), and by a Research Grant, from Ministry of Education of the People’s Republic of China.