But a group of medical economists led by Kevin Schulman, of Duke University in North Carolina, doubts the feasibility of this goal.

但一群由北卡罗琳娜杜克大学凯文·舒尔曼领导的医疗经济学家怀疑该目标的可行性。

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Kevin Ezell, president of the North American Mission Board.

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Kevin Guskiewicz, director of the University of North Carolina's Matthew Gfeller Sport-Related Traumatic Brain Injury Research Center, said the "vast majority" of kids playing in youth football leagues aren't going to have the type of exposure to injury NFL players have.

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Kevin Hodgson, director of operations at the Great North Air Ambulance Service, worked alongside Mr Barnes for several years, flying on life-saving missions across the North.

BBC: Capt Pete Barnes