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https://www.zeit.de/digital/mobil/2019-11/fitbit-smartwatch-anbieter-google-uebernahme
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https://www.ahajournals.org/doi/10.1161/CIR.0000000000000678
https://www.spiegel.de/gesundheit/ernaehrung/altern-gehgeschwindigkeit-verraet-das-biologische-alter-a-1292429.html
https://www.welt.de/kmpkt/article201868036/Gesundheit-Was-die-Gehgeschwindigkeit-ueber-deinen-IQ-verraet.html
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Dog ownership associated with longer life, especially among heart attack and stroke survivors https://www.sciencedaily.com/releases/2019/10/191008083121.htm https://www.heilpraxisnet.de/naturheilpraxis/hunde-schuetzen-das-herz-und-verlaengern-das-leben-20191008469386
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