The Interphone Study Group. Brain Tumor Risk in Relation to Mobile Telephone Use: Results of the INTERPHONE International Case-Control Study. International Journal of Epidemiology (in press). doi: 10.1093/ije/dyq079 Published on: Jul 20, 2014 at 02:11 Is 30 minutes a day really a heavy cell phone user? I t is safe to say these usage numbers are […]










