Two of the articles on the study are in 2011 and one can safely assume that a large number of students still have a phone from the year or earlier.
The fact that a cell phone is compared to the radiation of a microwave or oven further proves the point, the key difference is your not placing any parts of your body so close to a microwave or oven for longer than 30 seconds where as a cell phone on the other hand is used hours per day by a student after and during school and is continously in close contact with them.
I wish I could agree with this but the human race must go on! It is in a rather troubling time but we must keep a speck of hope and I'm certain there will be a select few champions of the coming generation that will combat "swag"