Shadow health secretary Andrew Lansley said the strategic health authority, which oversees NHS standards regionally, had had the "wool pulled over its eyes".

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Wearing a black wool cap pulled down against the biting chill of a Chicago winter morning, Vallas bounds up to the doors of tenements on the city's gritty South Side.

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Up to 12 colors of bright merino wool yarn are pulled from cones dangling from the ceiling into the teal-colored machines' high-speed knitting needles.

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