And of course, you, the person signing the license application, you are responsible for anything going wrong.

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You are also very closely monitored while you are taking part in a study, so the chances of something going wrong are incredibly slight.

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"One of the risks of my job is that you are going to be wrong about a lot, " Newhouse says.

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"If you are going to be disintegrated by watching somebody die, then it's the wrong role, " he says.

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