A number of us are working on this. There is now evidence that in the United States there have been increases in brain cancers associated with cellphone use. People have said that it hasn't happened, but in fact it has happened. I'm collaborating with Dr. Davis, who's coming here next week, on a paper that will document this further.
There is also a large international collaboration now ongoing of studies identifying large numbers of people whose exposure will be documented. They will be followed for several years to find out whether or not their exposure to the radio frequency field has increased their risk of cancer. But this is a very long-term endeavour. It will probably take a decade or more to get information of that sort.
So there is a lot of activity. There isn't very much, I'm afraid, in this country, except for the MOBI-KIDS study, but I believe people are increasingly recognizing the need to collect the necessary data to provide us with the information we require.