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of the evaluated dry-cleaners had heavy smoking and drinking habits which are known carcinogens and were exposed to many other chemicals at the workplace. A study published in 2011 investigated cancer rates among dry cleaners exposed to perchloroethylene for many years and laundry workers who were not exposed to perchloroethylene as the control group, based on a total of more than nine thousand people, found no difference in the cancer rates between the two groups: there was no significant increase in the

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