When we hear the phrase "digital health," we might think about our Fitbit, the healthy eating app on our smartphone, or maybe a new way to email our doctor.
But Fitbits aren't particularly useful if you're homeless, and the nutrition app won't mean much to someone who struggles to pay for groceries. Same for emailing your doctor if you don't have a doctor or reliable internet access.
A small but growing effort is underway - aimed at using digital technologies -- particularly cellphones -- to improve the health of Americans who live on the margins. They may be poor, homeless or have trouble getting or paying for medical care even when they have insurance.
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