Prof Shepherd, who was a surgeon at Cardiff's University Hospital of Wales, started his work in 1996 after realising that a great deal of violence which resulted in hospital treatment was not known to the police because victims did not report it.

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The cyclist - a window-cleaner on his way to work - is said to be in a stable condition in hospital.

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Colleagues raised concerns about his work soon after he took up a post at the Prince George Hospital in British Columbia.

BBC: Mr Richard Neale

Sinai Hospital in New York City, says that more than 100 of his students work with a model Stan each year.

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