References 1 - 6 for Abhängig von iPhone & Co.
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[1] Zahlen
[2] Handy
[3] Patrick Thibodeau von unserer amerikanischen Schwesterpublikation Computerworld
[4] Professor Rosen empfiehlt, alle paar Stunden einen Tech-Break einzulegen.
[5] Smartphones
[6] Smartphone
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