The application is called Echoes app and what the interested party has to do is to place their mobile phone on their chest. The device will record not only the heart rate but also a series of data, such as the sounds created between the opening and closing of the valves. Read the full article here (in Greek): https://m.naftemporiki.gr/story/1913118/nea-efarmogi-metatrepei-to-kinito-tilefono-se-stithoskopio
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