The involvement of Asics, which makes baseball player Ichiro Suzuki's spikes and is Japan's biggest sporting-goods company, in Thursday's accident led some activists to call for more pressure on non-Western brands to join efforts to tighten their supply chains.

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It also went on "Children in the manual social classes are twice as likely to die in an accident as those in the non-manual classes, and the poorest two fifths are one and a half times as likely to be at risk of a mental illness as the richest two fifths".

BBC: Minding the health gap

But the panel also identifies non-technical factors that it says likely contributed to the accident.

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