Texting again at 3 a.m.? Your phone could tell your doctor. The habits and symptoms your smartphone can know about you are fast becoming part of a powerful medical toolkit. Mobile software applications collectively known as mHealth have the potential to extend the reach of health interventions far beyond that of traditional care, especially for chronic diseases. After all, treatments for diabetes, asthma, or obesity require everyday vigilance, not just occasional clinic visits. New and valuable …

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