In 1945, there were 1,000 women who worked in a factory painting radium dials on watches. The 30-year incidence of bone cancer in these women was compared with that of 1,000 women who worked as telephone operators in 1945. 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(n): Cohort study Experimental study Ecological study Cross-sectional study Case-control study
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