 An estimated 10,000 machines were sold in the US, 3,000 in the UK, 1,500 in Switzerland, and 1,000 in Canada before authorities began discouraging their use.As understanding grew of the long-term health effects of radiation, a variety of bodies began speaking out and regulating the machines.A shoe-fitting fluoroscope can be seen near the beginning of the film "Billion Dollar Brain" starring Michael Caine.