In 1945 there were 1,000 women who worked in a factory paint…
In 1945 there were 1,000 women who worked in a factory painting radium dials on watches. The incidence of bone cancer was traced using historical medical records over time in these women up to 1975 and compared with that of 1,000 women who worked as telephone operators over a similar period. Twenty of the radium dial painters and four of the telephone operators developed bone cancer between 1945 and 1975. This study is an example of a:
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