people who use the phone for 15 - 20 minutes will cause the strain more than those who do not use if you are using more than 60 minutes have a number of people who felt strain increased to 4.As far as the 1 on the phone for 15 - 60 minutes per day with a headache symptoms is more 2.7 times, and 6.3 times as long as more than 60 minutes per day.
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