What is physician advocacy? Can anyone give me an example?

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Can anyone give me an example of how physicians advocate for their patients?
A migrant worker's daughter has no insurance and is of the age to get HPV vaccine. Her parents can't afford $160 for each of the three shots. The doctor calls Merck (which produces the vaccine) and finds out that if the patient fills out a form certifying she has no insurance that covers the vaccine, she can get it for free. Merck sends it to your office after receiving the form. You administer the vaccine. You have advocated for the patient.
 
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