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Peter Day reports from Silicon Valley on the cutting-edge innovation that's promising to transform healthcare. From apps which monitor your fitness to phone attachments that diagnose ear infections, the boom in high-tech gadgets is attracting millions of pounds of venture capital money. But can the technology companies really come up with the goods which will make us live longer, healthier lives?

Contributors, in order of appearance:

Ashwin Raut, Samsung
Young Sohn, Samsung
Sam De Brouwer, Scanadu
Eric Douglas, Cellscope
Vinod Khosla, Khosla Ventures
Daniel Kraft, Singularity University
Elizabeth Holmes, Theranos
Esther Dyson, HICCup

Producer: Ruth Alexander.