Health care professionals, especially doctors and nurses, enjoy an unprecedented role as positive messengers for health in society.

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But other doctors, especially oncologists used to the rigorous standards of proof required for big drug trials, note a lack of controlled trial data showing that the procedure extends life.

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Indeed, many doctors continue to rely on drug companies for continuing education--especially with regards to particular drugs--because they believe it's important for good patient care.

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Doctors and insurers are questioning the use of high-priced implanted gadgets--especially for patients who are not deathly ill.

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