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Prof Fares Haddad, a hip and knee surgeon at University College Hospitals in London, tells Lesley Curwen that many stem cell treatments are ineffective, unregulated and can cause harm. There are many private clinics claiming to be able to harness stem cells' healing powers. They offer to treat many conditions from arthritis to autism using regenerative therapies.

(Image: Microscope shot of multipotent stem cells. Credit: AFP/Getty Images.)