This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. Aim is to promote the circulation of scientific research by offering an ideal research publication platform with high standard. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.

Editor guiding this retraction: Prof. Zhihua Zhang (Editor-in-Chief of AJCC)

The full retraction notice in PDF is preceding the original paper, which is marked "RETRACTED".