(INSIDER) — The US healthcare system is suffering from a doctor shortage. Of those, primary care physicians are often hit the hardest, posing a huge problem as the country’s population grows and ages.

According to a recent report by UnitedHealth Group, 44 million US residents live in a county with a primary care physician shortage. That’s 13% of the national population, with residents living in rural areas five times more likely to be impacted by the shortage.

Part of this problem arises from the medical school pipeline — there are simply not enough medical students choosing to go into primary care.

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