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Cancer News in Context, Your Disease Risk, Zuum, and Your Health Snapshot also do not sell or share any visitor information with outside parties or post ads of any kind. The sites are supported by funds from Washington University and Barnes-Jewish Hospital.
For details on how this approach sets us apart from many scientists, physicians, and websites, see the New York Times article:
A Better Health Quiz (specifically about Your Disease Risk)
For two examples of poor privacy and conflict of interest practices, see these articles:
Payments to Doctors by Pharmaceutical Companies Raise Issues of Conflicts
For two examples of poor privacy and conflict of interest practices, see these articles: