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Correspondence MEDIALJOUNL 763 cervical carcinoma. These, if spread over the suggested period of 20 years for the development of the disease, would present at the rate of 21 cases every year-thatt is, precisely at the known annual incidence. It is therefore necessary for all the detected preclinical cases to progress to clinical cancer, if left untreated, to produce the expected number of clinical cases each year. The incidence of the disease has dropped in screened populations, both here2 anddoi:10.1136/bmj.2.5659.763-c fatcat:5k5y4ojfsfa6fn7jfkr3yquv6m