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Smartphone Survey
How long do you use your smartphone for lecture and study-related activities per day?
1-2 hours.
ago about 12y
1
ago about 12y
0.5
ago about 12y
0.5
ago about 12y
2
ago about 12y
0.5
ago about 12y
0.5
ago about 12y
24
ago about 12y
1
ago about 12y
1
ago about 12y
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