DOI:
10.1055/s-00034916
Nervenheilkunde
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References
Lu T..
Almost half of smartphone users spend more than 5 hours a day on their mobile device. Counterpoint Research, October 12th, 2017.
https://www.counterpointresearch.com/almost-half-of-smartphone-users-spend-more-than-5-hours-a-day-on-their-mobile-device/ accessed January 6th, 2018)
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