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SAVILE ROW in London is best known for producing some of the world’s finest bespoke suits. But tucked away in a quiet corner of the same street is a firm that gives tailored health advice through a smartphone app. Your.MD uses artificial intelligence to understand natural-language statements such as “I have a headache” and ask pertinent follow-up questions. The app typifies a new approach to mobile health (also known as m-health): it is intelligent, personalised and gets cleverer as it gleans data from its users. There are now around 165,000 health-related apps which run on one or other of the two main smartphone operating systems, Apple’s iOS and Google’s Android. PwC, a consulting firm, forecasts that by 2017 such apps will have been downloaded 1.7 billion times. However, the app economy is highly fragmented. Many providers are still small, and most apps are rarely, if ever, used.