Acknowledgements
We acknowledge the surgical cooperation from Prof. X Zhang, Prof. X Ma, Prof. H Li and Dr. B Wang from Faculty of Urology Surgery. We thank to Prof. B Jia, Prof. H Liu and Dr. P Li from Faculty of General Surgery. We appreciate Prof. R Liu, Dr. Z Zhao, Dr. G Zhao, Dr. X Zhang from Faculty of Hepato-Biliary-Pancreatic Surgery. Our partners mentioned above all work in the First Medical Center of Chinese PLA General Hospital.