The U.S. Center for Medical Consumers called this leaflet "the first honest mammography information for women written by health professionals" available now only at the Wayback Machine here: Mammography Screening Leaflet

"The information women receive when they are invited to attend for screening with mammography is insufficient, one-sided and erroneous. The letters of invitation emphasize the benefits of screening, but they do not describe how many healthy women will experience the most important harms, overdiagnosis and over treatment.

Information on the internet, e.g. on cancer charity web sites, often omits the most important harms. Or they are described as benefits. For example, screening is said to reduce the risk that a woman loses her breast. This is not true. Because of overdiagnosis and overtreatment, screening increases the risk of mastectomy."

The following websites are recommended if you would like further information:

the National Breast Cancer Coalition (www.stopbreastcancer.org), whose members are mainly women with breast cancer, and
the Center for Medical Consumers (www.medicalconsumers.org)