The point guard with a lethal three-point shot didn't show any cracks, and his teammates rarely knew much about the struggle he and his father faced.

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Previously, researchers could only point out people who suffered from the worst and most lethal form of the disease.

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In the lethal U.S. market, where makers scrap to gain a tenth of a point in market share, Nissan and its Infiniti luxury brand have picked up nearly two and a half points, rising to 6.3% since Ghosn took over.

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Dr David Gunnell and colleagues from Bristol University point out that the method of suicide favoured by women - drug overdose - has become less lethal owing to the replacement of barbiturates by the less toxic benzodiazepines in the 1980s.

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