“That was very reassuring,” said Dr. Michael W. Weiner, an Alzheimer’s expert at the University of California, San Francisco.

来自旧金山的加州大学老年痴呆症专家Michael W.Weiner博士说，“这太让人欣慰了！”

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Dr. Gary W. Ellison, of the College of Veterinary Medicine at the University of Florida, cautioned that the procedure can lead to complications.

格雷·艾利斯博士，供职于佛罗里达大学动物学院，警告说手术会带来隐患。

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“They’re a long way from demonstrating the robustness of their technique, ” said Dr. Neil W. Schluger, a professor of medicine at Columbia University who specializes in lung diseases.

哥伦比亚大学专门从事肺病研究的医学教授尼尔·W·施拉格（ Neil W. Schluger）博士说：“要证明这个方法的稳定性还有很长的路要走。”

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"The maximum speed is an inch a month for nerve regeneration, " Dr W P Andrew Lee, who led the 13-hour surgery last month at Johns Hopkins Hospital in Baltimore, Maryland, told a news conference on Tuesday.

BBC: Brendan Marrocco, US quadruple amputee, gets new arms