"He applied the (neuro-surgery) techniques to urinary surgery. We could see very few clinical patients, and we did not witness his operations either. We simply were not able to make any comments. It was Xiao who brought the patients in, and I did not watch the operation. He had no publication at that time. We knew even less about how the international peers evaluated his procedure. Everything was based on his own words. We could not see any comments from other countries. He said we would not be able to conduct the operation, but why they themselves were not able to popularize it either? We do not understand." Guo Ying-lu, a professer of Beijing Medical University and an academian of China Engineering Academy, told Science News.