A doctor who performs mammograms or if they are an oncologist, develop biases when weighing evidence! His or her biases do not have to stem from greed. They could simply come from performing a lot of the same procedures and not being in a position to assess harm. This being said, I would rely on the USPSTF recommendations. They remove subspecialties from being involved in the writing of the panel. For example, they excluded radiologists, the specialists who provide mammography, on recommendations on breast-cancer screening.