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I don't know what I want to do after university http://buy-levitra.in.net/ levitra  The experiment, led by Yaniv Hamzany, an ear, nose and throat specialist with Tel Aviv University's Sackler Faculty of Medicine, compared the saliva of 20 heavy cellphone users (those who spoke on their cellphones an average of 30 hours per month) with the saliva of 20 individuals, most of whom are deaf and either don't use a cellphone or use it for non-verbal functions like texting. The results: The heavy cellphone users showed more signs of oxidative stress.