The situation was totally unexpected, said Bernard Begaud, a pharmacologist at the University of Bordeaux in France. "The brain imaging was very strange, unlike anything we know in medicine," he says.
He led the independent scientific investigation of what went wrong. Their report, released in April, outlined hypotheses on what happened and called for some changes in how clinical trials are conducted. The group concluded that the trial followed the rules and was perfectly legal but suffered from missteps.
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