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Data from the spreadsheet was abstracted and a new data table was created that contained the following information:  1. The name of the country where the screening for breast cancer,   2. The percentage reduction in the usage of HRT between peak use and the last reported use  3. The percentage reduction in the reported incidence for the corresponding years for the relevant age groups (50-64+)  4. The Age Range at which Screening for Breast Cancer using Mammograms begin. If the age range was 50-64 years, it was given a code of 1, else if the age at which mammogram began was earlier (that is for younger age), the Age range variable was assigned a code of 2.  In addition to this, data from the papers by Verkooijen et al \cite{Verkooijen:Maturitas:2009}